# Patent

## Title
Low permeation weldable fuel tank assembly

## Abstract

A low permeation weldable fuel tank assembly is provided to reduce fuel vapor permeation from a fuel tank. The weldable fuel tank assembly has a mounting portion mountable to the fuel tank and a valve housing that is attachable to the mounting portion. In one aspect, the mounting portion includes a fuel vapor permeation barrier. In another aspect, an anti-permeation cap with a fuel vapor permeation barrier is affixed to a portion of a tank assembly.

## Background
RELATED APPLICATIONS
The present application is a continuation application of and claims priority to U.S. patent application Ser. No. 10/356,380, filed Jan. 31, 2003 now U.S. Pat. No. 6,915,812.


FIELD OF INVENTION
The present invention relates to a weldable fuel tank assembly with a permeation barrier to reduce fuel vapor permeation from a fuel tank.
BACKGROUND OF INVENTION
In the field of automotive fuel systems, fuel tanks are made typically from a weldable polymeric material such as a high-density polyethylene (HDPE). A polymeric fuel tank is resistant to corrosion and can be efficiently manufactured, such as by blow molding, which permits flexibility in fuel tank design. Further, since the polymeric fuel tank is lightweight, the vehicle in which it is installed is more fuel efficient and economical to operate.
Relatively soft polymeric materials that lend themselves to efficient fuel tank manufacturing typically are not suitable for making quality fuel system components, such as vent valves. For instance, a vent valve made largely or entirely out of the same material as the fuel tank can be damaged using a conventional method such as hot plate welding to weld a port for the vent valve to the polymeric fuel tank. On the other hand, harder materials such as nylon with higher-melting temperatures suitable for use in the vent valve are difficult if not impossible to weld to the polymeric fuel tank. Nylon and HDPE, for example, simply do not weld together very well due to their different melting temperatures and other properties.
Various mounting assemblies have been proposed to overcome problems associated with mounting fuel system components, such as the nylon vent valve, in a wall of the polymeric fuel tank. However, due to the incompatibility of tank and fuel system component materials, interfaces continue to suffer from fuel vapor permeation problems permitting hydrocarbons to escape from the fuel tank.
Government regulations and environmental concerns will likely continue to escalate. Therefore, a non-weldable vent valve structure is needed that can be efficiently produced and securely attached to a polymeric fuel tank to reduce fuel vapor permeation from the fuel tank.
BRIEF SUMMARY OF INVENTION
The present invention provides a weldable fuel tank assembly with a permeation barrier to reduce fuel vapor permeation from a fuel tank and methods of attaching such assemblies to fuel tanks. The component parts of the invention are simple, reliable, and economical to manufacture, assemble, and use. Other advantages of the invention will be apparent from the following description and the attached drawings, or can be learned through practice of the invention.
According to an aspect of the invention, a fuel system apparatus for weldable attachment to a fuel tank is provided. The fuel system apparatus has a valve assembly attachable to a mounting portion. The mounting portion is attachable to a surface of the fuel tank and has an inlet in communication with an inside of the fuel tank and an outlet for communicating fuel vapor from the fuel tank to a recovery canister. The mounting portion includes a laminate with multiple layers including a weldable layer. One of the layers is an anti-permeation layer such ethylene vinyl alcohol copolymer (EVOH) resin to block fuel vapor permeation from the mounting portion and the surface of the tank where the mounting portion is attached.
According to another aspect of the invention, a fuel system apparatus for weldable attachment to a fuel tank similar to the foregoing embodiment is provided. In this aspect of the invention, the fuel system apparatus includes a valve assembly attached to a mounting assembly. The mounting assembly has a body, a passageway within the body in communication with an inside of the fuel tank, an annular rib surrounding a portion of the passageway, and a weldable extension. The weldable extension includes a laminate, such as EVOH to block fuel vapor permeation from the fuel tank, and a weldable layer. The weldable extension is welded on a separate mount or directly to the fuel tank in which only its weldable layer is welded. An o-ring or similar device can be radially sealed by the extension to further reduce fuel or fuel-vapor permeation from about the tank surface in this aspect of the invention.
In a further aspect, a fuel system apparatus for a fuel tank is provided with a mounting assembly having a mount body, a weldable extension, and a laminate disposed thereon. The laminate includes a gas permeation layer to block fuel vapor permeation of the fuel tank. A mount is interposed between the extension and the fuel tank and welded to the fuel tank. A heat stake or similar device is used to connect the mount body and the weldable extension. A valve assembly is included and attached to the mounting assembly.
According to another aspect of the invention, a fuel vapor control valve for weldable attachment to a fuel tank is provided, which includes a mounting portion connectable to a surface of the fuel tank, a valve assembly attached to the mounting portion for selectively opening and closing the flow through the passageway, and an anti-permeation portion attached to and substantially covering the mounting portion spaced apart from the surface of the fuel tank. The mounting portion has a weld foot weldable to a surface of the fuel tank. The anti-permeation portion has a multi-layer laminate to block fuel vapor permeation from the fuel tank.
Further, in this aspect the fuel system apparatus includes a nozzle with an outlet in communication with an atmosphere apart from the fuel tank. The nozzle can be connected to the mounting portion after the mounting portion is formed. Also, the nozzle may include a metal sleeve or the like disposed in the nozzle to increase rigidity of the nozzle.
In yet another aspect, a method for attaching an anti-permeation portion to a fuel vapor control valve for weldable attachment to a fuel tank is provided, which includes the steps of:

    
    
        providing a mounting portion connectable to a surface of the fuel tank, the mounting portion having a weld foot weldable to the surface;
        providing an anti-permeation portion for attachment to the mounting portion; and
        attaching the anti-permeation portion to the mounting portion such that the anti-permeation portion is spaced apart from the surface, wherein the anti-permeation portion is configured to block fuel vapor permeation from the fuel tank, the anti-permeation portion comprising a multi-layer laminate.
    
    


As in the previous embodiments, the multi-layer laminate may include EVOH or a similar material or device to reduce or prevent gas permeation from the fuel tank.
Also the method may include the additional steps of inserting a nozzle in the mounting portion subsequent to or substantially simultaneously with attaching the anti-permeation portion; and inserting a sleeve in the nozzle to increase a rigidity of the nozzle.
Additional features and advantages of the invention will become apparent to those skilled in the art upon consideration of the attached drawings in conjunction with the following detailed description of the drawings, which exemplifies the best mode of carrying out the invention as presently perceived, or can be learned through practice of the invention.



BRIEF DESCRIPTION OF THE DRAWINGS
The above and other aspects and advantages of the present invention are apparent from the detailed description below and in combination with the drawings in which:
FIG. 1 is a sectional elevational view of one embodiment of an assembly particularly showing a multi-layer permeation barrier in accordance with an aspect of the present invention;
FIG. 2 is a sectional elevational view of another embodiment of an assembly;
FIG. 3 is a sectional elevational view of a further embodiment of an assembly; and
FIG. 4 is a perspective view of an assembly according to another aspect of the present invention.



The detailed description below uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and description have been used to refer to like or similar parts of the invention.
DETAILED DESCRIPTION OF THE DRAWINGS
Detailed reference will now be made to the drawings in which examples embodying the present invention are shown. The drawings and detailed description provide a full and detailed written description of the invention, and of the manner and process of making and using it, so as to enable one skilled in the pertinent art to make and use it, as well as the best mode of carrying out the invention. However, the examples set forth in the drawings and detailed description are provided by way of explanation of the invention and are not meant as limitations of the invention. The present invention thus includes any modifications and variations of the following examples as come within the scope of the appended claims and their equivalents.
As broadly embodied in the Figures, a fuel system apparatus is provided with a multi-layer permeation barrier to reduce fuel vapor permeation from a fuel tank. The fuel tank may be made of a weldable material such as high-density polyethelene (HDPE) although other polymers or metals such as stainless steel, aluminum, a non-corrosive alloy or combinations of these and other materials suitable for welding fuel system components to the fuel tank can be used. The fuel system apparatus includes a connection or mounting portion, and a valve having a float or valve member movably disposed in a chamber of a valve housing. The mounting portion is mountable to a wall of the fuel tank, and the valve is attachable to the mounting portion.
The permeation barrier depicted in the Figures is disposed on the mounting portion or sections of the mounting portion, a mount separate from the mounting portion, and various other elements, depending on the materials utilized to form the elements. As discussed in greater detail below, the permeation barrier can be applied to the various elements by a spray, a lamination, a dip/bath, an extrusion, a molding, and/or an adhesive process and the like. Therefore, it should be understood that the following descriptive examples of the invention are not intended to limit the present invention to use only as shown in the Figures.
With general reference to FIG. 1, according to one embodiment of the invention, a weldable fuel system apparatus 10 is attached to a fuel tank T via an aperture A in the fuel tank T. The fuel system apparatus 10 includes a valve 12, an interface 30, and a mounting portion 40. The mounting portion 40 in this aspect is welded to the tank T and includes a barrier 42 that acts as a vapor penetration or permeation barrier against fuel vapor permeation from the fuel tank T. Exemplary applications and operations of the barrier 42 are described in greater detail below.
FIG. 1 shows that the valve 12 has a housing 14 that is at least partially disposed in an inside of the fuel tank T. The valve 12 may be positioned and sized as depicted in FIG. 1, for instance, to control a fuel level (not shown) or to shut off fuel flow in the event of a rollover. The housing 14 of the valve 12 defines a chamber 15 in which a valve member or float 16 is operably disposed to selectively open or close communication between the inside of the fuel tank T and an external atmosphere. The float 16 is held in the chamber 15 by a retainer 22, which is mounted to the housing 14 by tabs and/or slots (not shown), adhesives, and similar mechanisms. Conversely, the housing 14 and the retainer 22 can be unitarily constructed. In this aspect of the invention, the housing 14 is constructed of POM (polyoxymethylene (acetal plastic)), nylon, PEEK (polyetheretherketone), or other thermoplastics suitable for the non-weldable valve 12.
The float 16 has a sealing element 18, which can be a point, a needle, a cone, a flat surface, or any shape or separate piece suitable to close an opening 26 in the housing 14 in order to control fuel filling or to shut off fuel flow in the event of a rollover. An exemplary operation of this aspect of the invention will be described in greater detail below. A plurality of apertures or slots 24 are defined in the retainer 22 to permit fuel and fuel vapor to enter the housing 14 and allow fuel vapor to discharge through the opening 26 and/or to act upon the float 16 to seal the opening 26. It should be noted that the quantity and shape of slots 24 are not limited to the example shown in FIG. 1. For instance, at least one of the slots 24 could be disposed on a portion of the housing 14.
FIG. 1 further shows that the housing 14 is releasably attached and axially secured to the interface 30 via a plurality of bayonets 32. The bayonets 32 are snap-fitted, for example, into a circumferential belt or a plurality of receptacles 28 disposed about the housing 14. The bayonets 32 may include beveled edges 33 and/or the receptacles 28 may include chamfered edges (not shown) to allow the bayonets 32 to be more easily slid into the receptacles 28. It is to be noted that any or all of the receptacles 28 and the bayonets 32 could be reversed such that at least one of the receptacles 28 is disposed on the interface 30 and at least one of the bayonets 32 is on the housing 14. Similarly, the invention contemplates that the receptacles 28 and the bayonets 32 may have alternately other complimentary shapes, such as dimples, ridges, arcs, spherical sections and the like.
While attaching the housing 14 to the interface 30 via the receptacle 28 and bayonet 32 combination, a seal 34, such as an o-ring, gasket, sealant, or the like, may be placed around the housing 14 in contact with an inner surface 31 of the interface 30 to further seal the housing 14 and the interface 30 together and reduce fuel vapor permeation. The interface 30 is in turn welded to the mounting portion 40. In this example, the interface 30 has a mating surface 36 that, like the mounting portion 40, is made of weldable HDPE. The mating surface 36 is welded to a complementary mating surface 44 of the mounting portion 40.
FIG. 1 further shows the fuel vapor laminate or barrier 42 disposed on the mounting portion 40 to make the mounting portion 40 less permeable than HDPE alone. In the example shown, the barrier 42 may have multiple layers including, for instance, an ethylene vinyl alcohol copolymer (EVOH) resin, depicted here as layer 42a (see FIG. 1 inset). EVOH is characterized by its gas barrier properties and its resistance to solvents, chemicals and the like.
The EVOH layer 42a in the present example is about 0.06 millimeters thick since tank manufacturing tolerances require that fuel tank valve assemblies discharge no more than about 10 milligrams per day of fuel vapor hydrocarbons. However, the layer 42a can have varying thickness such as between about 0.001 millimeters to about 5 millimeters available, for instance, under the brand name EVALTM from EVAL Europe N.V. in Zwijndrecht, Belgium, although comparable sources may be substituted. Likewise, although EVOH is used as layer 42a, any resin or material with suitable gas barrier properties can be substituted for the layer 42a within the scope of the invention.
The layer 42a is co-extruded with a layer 42c of HDPE to protect the EVOH from external wear. A layer of adhesive 42b is also co-extruded and disposed between the layers 42a and 42c to adhere the HDPE and EVOH together since HDPE and EVOH are not chemically bonded. An adhesive suitable as adhesive 42b is available under the brand name ADMERTM GT6E resin from Mitsui Chemicals Europe GmbH of Duesseldorf, Germany. However, it is to be noted that any comparable adhesive suitable for adhering layers 42a, 42c together can be used according to the present invention. It is to be further noted that although the layers 42a–c are co-extruded, other processes such as laminations, baths, sprays, overmolding, and the like can be used to form the multi-layer barrier 42.
For further clarity, the inset in FIG. 1 shows the multiple layers of the barrier 42. Specifically, the inset shows an enlarged portion of a weldable concentric ring or extension 46 of the mounting portion 40. In this example, the extension 46 defines a weld foot 48 formed from HDPE. The barrier 42 is disposed on the extension 46 proximate the weld foot 48. The barrier 42 includes the inner layer of EVOH 42a, the adhesive layer 42b, the layer of HDPE 42c, an outer layer of conductive HDPE 42d, another adhesive layer 42e, another inner layer of HDPE 42f, and another outer layer of conductive HDPE 42g, which is ultrasonically welded to the extension 46. In this example, a specific extruder (not shown) used to form the barrier 42 optionally provides the conductive HDPE layers 42d, 42g. 
The inset of FIG. 1 also shows that the exemplary barrier 42 angles away from the tank T at about 45° on the extension 46 proximate the weld foot 48. This arrangement spaces the barrier 42 apart from the tank T, which permits the weld foot 48 to be welded via a weldpoint 48a to the tank T. In other words, the multi-layer barrier 42 does not interfere with welding the weld foot 48, but the barrier 42 is positioned to counteract permeation from the fuel tank T.
Although the barrier 42 terminates at about a 45° angle near the weldpoint 48a in the FIG. 1 inset, the barrier 42 may have any termination angle, such as between about 90° to about 270° approximately parallel to the tank T. Alternatively, the barrier 42 can be angled in a substantially opposite direction away from the weldpoint 48a, such as to about 315° to about 350°. Moreover, the barrier 42 may not be curved at all but may be applied on a tank port with a different aspect angle; i.e., the tank port can have a straight edge substantially perpendicular to the tank T such that the barrier 42 would be flatly applied to the tank port such that only the weldable portion of the barrier 42 is welded to the surface of the fuel tank T.
Moreover, although the barrier 42 in FIG. 1 is applied to substantially the entire mounting portion 40, including the nozzle 52 in this example, the barrier 42 can be selectively applied to specific elements. For instance, if the nozzle 52 is made of POM, an additional gas permeation barrier such as barrier 42 may not be required, and it may be desirable to apply the barrier 42 only to the extension 46 as described above. Further, instead of or in addition to applying the barrier 42 on an external surface of the mounting portion 40 as depicted, the barrier 42 can be applied on an opposing or internal surface of the mounting portion 40 or elements thereof.
The foregoing embodiment may be better understood with reference to an exemplary operation. As shown in FIG. 1, the fuel system apparatus 10 is in an open condition, which permits fuel vapor from the fuel tank T to enter through the slots 24 and continue through the opening 26 and a gap 38 of the interface 30 into a passageway 50 of the nozzle 52. The fuel vapor then continues via an outlet 56 of the nozzle 52 to a fuel vapor recovery device (not shown), for example, to evacuate fuel vapor from the inside of the fuel tank T. If desired, a sleeve 54 formed of metal or other hardened material can be inserted in the nozzle 52 for additional rigidity to strengthen the nozzle 52.
When an operator (not shown) fills the tank T with fuel, the rising fuel may contact the float 16. As the fuel rises, it enters the slots 24 and contacts the float 16. In this aspect of the invention, the float 16 is heavier than the fuel; therefore, a spring 20 is inserted in float 16 to urge the float 16 in a direction of the opening 26. The combination of the rising fuel and a spring constant of the spring 20 eventually overcomes a preset weight of the float 16 and urges the float 16 into an engagement with or about the opening 26. When the float 16 is buoyed against the opening 26, the sealing element 18 at least momentarily closes the opening 26, which closes the fuel system apparatus 10. It should also be noted that the float 16 could close the opening 26 when the fuel tank T is inclined beyond a preset inclination level greater than, for example 60°. Such an inclination angle might occur if the vehicle rolls over or is on a grade or hill. In these cases, the inclination angle would cause the fuel to contact float 16 and drive the float 16 in the direction of the opening 26 as described.
FIG. 2 shows another aspect of the invention. Here a weldable fuel system apparatus 110, in some ways similar to the previous embodiment, is attached to the tank T using a circumferential extension 146, a circumferential weldable mount 148 and/or a circumferential weldable mount 149 with a plurality of heat stakes 158. In other words, the extension 146 may in one aspect be ultrasonically mounted to mount 148 (see left side of FIG. 2); or in another aspect, the extension 146 may be mechanically attached to mount 149 (see right side of FIG. 2); or in a further aspect, the extension 146 may be mounted using a combination of these arrangements. These alternative mounting arrangements are discussed in greater detail below.
With further reference to FIG. 2, the fuel system apparatus 110 includes a valve 112 with a housing 114 made of POM in this aspect. The fuel system apparatus 110 further includes a mounting portion 140 made of POM, nylon, or any material suitable to prevent fuel vapor permeation. Accordingly, an HDPE part, such as the mount 148, 149, is desirable to mount the fuel system apparatus 110 to the tank T. As depicted in FIG. 2 and detailed below, the mounts 148, 149 are sealed utilizing an o-ring 160, which is radially sealed by the extension 146.
The weldable mount 148 includes the multi-layer barrier 142a, which is spaced apart from the tank T in the form and manner described with respect to the previous embodiment. That portion of the weldable mount 148 lacking an anti-permeation layer of the barrier 142a is welded to the tank T. The o-ring 160, which may also be a sealant, a gasket or the like as previously described, will be inserted between the extension 146 and the weldable mount 148 to create a fuel and fuel-vapor seal.
The extension 146 can be mechanically attached to the mount 149 with a heat stake 158, which can extend through the mount 149 into the tank T if desired. The heat stake 158 can be a rivet, a screw, a pin, or a solder joint and the like. Again, the extension 146, the mount 149, and the heat stake 158 may incorporate the o-ring 160 to further seal against fuel permeation to an external atmosphere. Moreover, the heat stake 158 may be coated with the barrier 142a to further limit fuel vapor permeation from the fuel tank T.
FIG. 2 further shows a circumferential belt or a plurality of tabs 128 of the housing 114 inserted or snap-fitted into a circumferential complementary ring plurality of receptacles 132 to hold the housing 114 to the mounting portion 140. In this aspect, the housing 114 includes a plurality of circumferential or annular ascending ribs 130 made of POM or the like that are complementarily inserted proximate a descending rib 142 of the mounting portion 140. The descending rib 142 is HDPE, which is fitted against the ascending ribs 130.
Alternative arrangements are contemplated in which the ascending ribs 130 and the descending ribs 142 are made of the same material but are sized differently such that the smaller, thinner circumferential rib expands more readily than its larger, thicker counterpart. Moreover, modifications and variations of the geometries and materials of the ribs 130, 142 can be made within the scope of the invention to achieve the same purpose. It is to be noted that the exemplary terms ascending and descending are not meant as limitations of the invention but are merely utilized to provide a full and enabling disclosure; thus, the weldable fuel system apparatus 110 and/or its ribs 130, 142 are not intended to be limited only to an upright orientation in a top wall of the fuel tank T.
FIG. 3 shows an alternative embodiment for a fuel tank apparatus 210 that includes a barrier 242a and an annular extension 246. The barrier 242a is similar to the previously described embodiments and reference is made to the foregoing multi-layer description for further details. In this aspect of the invention, the mounting portion 240 is attached to a circumferential weldable mount 248 via the extension 246. The weldable mount 248 also includes the multi-layer barrier 242a as previously described and reference is made thereto. The weldable mount 248 is attached to the mounting portion 240 by a press-fit and then mounted to the tank T, such as by ultrasonic welding or clipping. Additionally, an o-ring 260 or similar device may be placed about and between the weldable mount 248 and the extension 246 to seal the components together to prevent fuel and/or fuel vapor permeation from the fuel tank T.
Similar to the embodiment described with respect to FIG. 2 above, in this aspect of the invention, a circumferential descending rib 242 of the mounting portion 240 is complementarily mated against ascending circumferential ribs 230 of the housing 214. The mounting portion 240 and rib 242 are made, for example, of acetal plastic or POM while the housing 214 and its ribs 230 are, e.g., POM or nylon. As previously described, the different heat reactive materials, shapes, sizes, or orientations of ascending ribs 230 and the descending rib 242 may cause the ribs 230, 242 to compress together to create a seal 234 such as when operation of the vehicle or external weather conditions heat the ribs 230, 242. Further operation of this exemplary embodiment is substantially similar to the foregoing embodiments and reference is made to the previous descriptions for further details.
FIG. 4 shows another aspect of the invention. This embodiment of a weldable fuel tank valve apparatus 310 includes a valve housing 314 attached to a mounting portion 340, which has a weldpad 340a for welding to a fuel tank T. As described above, HDPE may be used for one or both of the weldpad 340a and the fuel tank T, although other suitable materials may be substituted.
The valve apparatus 310 is in some ways similar to the previously described embodiments. In this aspect of the invention, an anti-permeation portion or cap 342 is attached to a surface 340b of the mounting portion 340 to provide a fuel vapor permeation barrier about the fuel system apparatus 310. In a further aspect, an exemplary HDPE nozzle 352 is inserted in the mounting portion 340 after the mounting portion 340 is formed and subsequent to or simultaneously with attachment of the cap 342.
Similar to the multi-layered permeation barriers previously described, the cap 342 in this example is formed of three to seven layers, more particularly ten layers, of various materials. For example, the cap 342 includes an innermost layer of conductive HDPE 342a, which is welded to the surface 340b. The cap 342 further includes a layer of HDPE 342b, an adhesive layer 342c, a layer of EVOH 342d, another adhesive layer 342e, another layer of HDPE 342f, and an outer layer of conductive HDPE 342g. As in the previous embodiment, the adhesive layers 342c, 342e are co-extruded with the EVOH layer 342d to bind the HDPE layers 342b, 342f to layer 342d since EVOH and HDPE are not chemically bonded. It is to noted that the cap 342 may include fewer or additional layers of polymers, metals, adhesives, and anti-permeation materials other than the exemplary HDPE and EVOH layers provided in this example.
Also in this aspect of the invention, the cap 342 is attached to the surface 340b by an adhesive, a weld such as an ultrasonic or hot plate weld, or by a mechanical device, such as screws, rivets, pins, and the like. If the cap 342 is hot plate welded, for instance, only that portion without a permeation layer is welded to the surface 340b. Further details are not necessary for one skilled in the art to understand how to attach the cap 342.
While exemplary embodiments of the invention have been shown and described, those skilled in the art will recognize that other changes and modifications may be made to the foregoing examples without departing from the scope and spirit of the invention. For instance, specific shapes of various elements of the illustrated embodiments may be altered to suit particular applications. It is intended to claim all such changes and modifications as fall within the scope of the appended claims and their equivalents.

## Claims

1. A fuel system apparatus for weldable attachment to a fuel tank, the fuel system apparatus comprising:
a mounting portion defining a passageway in communication with an inside of the fuel tank, the mounting portion including a multi-layer permeation barrier having multiple layers including a weldable layer, the multi-layer permeation barrier configured to block fuel vapor permeation from about the mounting portion, the mounting portion further including a weld foot defining an exterior side and an interior side, the sides configured for welding to a surface of the fuel tank at respective weldpoints, the multi-layer permeation barrier being disposed at least within the weld foot and configured within the weld foot such that the sides of the weld foot are welded to the fuel tank surface at the respective weldpoints, the multi-layer permeation barrier being spaced apart from the weldpoints; and
a valve assembly attached to the mounting portion and at least partially disposed in the inside of the fuel tank and configured to selectively open or close communication between the passageway to the inside of the fuel tank.

2. The fuel system apparatus of claim 1, wherein the multi-layer permeation barrier is disposed on the weldable layer spaced apart from the surface of the fuel tank.

3. The fuel system apparatus of claim 1, wherein the multi-layer permeation barrier is selected from the group consisting of a polymer, a metal, an adhesive, an anti-permeation material, and combinations thereof.

4. The fuel system apparatus of claim 3, wherein the polymer is one of an HDPE or a conductive HDPE.

5. The fuel system apparatus of claim 3, wherein the anti-permeation material is EVOH.

6. The fuel system apparatus of claim 1, wherein the mounting portion is comprised substantially of the multi-layer permeation barrier and defines a mounting surface and further including an interface disposed between the mounting surface and the valve assembly, the interface having a complementary surface configured for attachment to the mounting surface.

7. The fuel system apparatus of claim 6, wherein the mounting portion defines an extension spaced apart from the interface with the weldable layer forming a portion of the weldable extension, the multi-layer permeation barrier disposed on the weldable extension such that the multi-layer permeation barrier is spaced apart from the surface.

8. The fuel system apparatus of claim 6, further comprising means for sealing the valve assembly and the interface together.

9. The fuel system apparatus of claim 8, wherein the means for sealing is selected from the group consisting of an o-ring, a sealant, a gasket, and combinations thereof.

10. The fuel system apparatus of claim 1, wherein the mounting portion is unitarily formed with the weld foot.

11. The fuel system apparatus of claim 1, wherein the multi-layer permeation barrier is only in the weld foot.

12. The fuel system apparatus of claim 1, wherein the mounting portion defines a nozzle having an outlet and a sleeve disposed in the nozzle, the outlet in communication with an atmosphere external to the fuel tank, the sleeve configured to increase a rigidity of the nozzle.

13. A fuel vapor control valve for weldable attachment to a fuel tank, the fuel vapor control valve comprising:
a mounting portion connectable to a surface of the fuel tank, the mounting portion defining a passageway in communication with an inside of the fuel tank, the mounting portion having a weld foot defining an exterior side and an interior side, the weld foot sides weldable to a surface of the fuel tank;
a valve assembly attached to the mounting portion for selectively opening and closing the flow through the passageway; and
an anti-permeation portion attached to and substantially covering the mounting portion spaced apart from the weld foot sides welded at the surface, wherein the anti-permeation portion is configured to block fuel vapor permeation from the fuel tank, the anti-permeation portion comprising a multi-layer permeation barrier.

14. The fuel system apparatus of claim 13, wherein the multi-layer permeation barrier is made from a material selected from the group consisting of a polymer, a metal, an adhesive, an anti-permeation material, and combinations thereof.

15. The fuel system apparatus of claim 13, wherein the mounting portion defines a nozzle having an outlet in communication with an atmosphere apart from the fuel tank, the multi-layer permeation barrier disposed on the nozzle such that the fuel vapor permeation is reduced from the nozzle.

16. The fuel system apparatus of claim 13, further comprising a nozzle having an outlet in communication with an atmosphere apart from the fuel tank, wherein the nozzle is configured for connection to the mounting portion and to a fuel vapor recovery canister spaced apart from the fuel tank.

17. The fuel system apparatus of claim 16, wherein the nozzle includes a sleeve disposed in the nozzle, the sleeve configured to increase a rigidity of the nozzle.

18. The fuel system apparatus of claim 13, wherein the anti-permeation portion includes EVOH.

19. A method for attaching an anti-permeation portion to a fuel vapor control valve for weldable attachment to a fuel tank, the method comprising the steps of:
a) providing a mounting portion connectable to a surface of the fuel tank, the mounting portion having a weld foot defining an exterior side and an interior side, the sides weldable to the surface;
b) extruding an anti-permeation portion with the mounting portion; and
c) attaching the mounting portion such that the anti-permeation portion is spaced apart from the surface and the weld foot sides are welded to the surface, wherein the anti-permeation portion is configured to block fuel vapor permeation from the fuel tank, the anti-permeation portion comprising a multi-layer permeation barrier.

20. The method as in claim 19, wherein the attaching step is selected from one of a welding step, an adhesive step, a mechanical affixation step, and combinations thereof.

21. The method as in claim 19, wherein the multi-layer permeation barrier includes EVOH.

22. The method as in claim 19, further including the step of welding the weld foot to the surface of the fuel tank.

23. The method as in claim 19, further including the step of inserting a nozzle in the mounting portion subsequent to or substantially simultaneously with attaching the anti-permeation portion.

24. The method as in claim 23, further including the step of inserting a sleeve in the nozzle, the sleeve configured to increase a rigidity of the nozzle.