Abstract:
A nozzle inhibitor is adapted to be arranged in a filler neck included in a fuel tank fill tube and is configured to allow only a diesel fuel nozzle having an outer diameter that is greater than a specified minimum diameter to be inserted into the fill tube to a depth sufficient so that a user may dispense diesel fuel from that nozzle into the fill tube. The nozzle inhibitor inhibits insertion of a small-diameter unleaded fuel nozzle into the fill tube, yet allows insertion of a large-diameter diesel fuel nozzle into the fill tube so that only diesel fuel is dispensed into a diesel fuel tank coupled to the fill tube.

Description:
PRIORITY CLAIM 
       [0001]    This application claims priority under 35 U.S.C. §119(e) to U.S. Provisional Application Ser. No. 61/905,447, filed Nov. 18, 2013, and U.S. Provisional Application Ser. No. 61/804,528, filed Mar. 22, 2013, which are both expressly incorporated by reference herein. 
     
    
     BACKGROUND 
       [0002]    The present disclosure relates to a fuel tank fill tube, and more particularly to a device for preventing the introduction of a nozzle for unleaded fuel into the fill tube of a fuel tank of a motor vehicle fitted with a diesel internal combustion engine. 
         [0003]    Unleaded fuel should not be introduced into a fill tube of a motor vehicle powered by a diesel engine. It is customary to use a small-diameter fuel-dispensing nozzle (e.g., 21.5 mm or less) to dispense unleaded fuel into a fuel tank fill tube and to use a large-diameter fuel-dispensing nozzle (e.g., 23.5 mm or more) to dispense diesel and leaded fuel into a fuel tank fill tube. 
       SUMMARY 
       [0004]    A nozzle inhibitor is adapted to be arranged in a fuel tank fill tube and is configured to allow only a diesel fuel nozzle having an outer diameter that is greater than a specified minimum diameter to be inserted into the fill tube to a depth sufficient so that a user may dispense diesel fuel from that nozzle into a diesel fuel tank coupled to the fill tube. Such a nozzle inhibitor inhibits insertion of a small-diameter unleaded fuel nozzle into the fill tube of a diesel fuel tank, yet allows a large-diameter diesel fuel nozzle to be inserted into the fill tube of the diesel fuel tank. 
         [0005]    In illustrative embodiments, the fill tube includes a filler neck coupled to the diesel fuel tank and a filler neck closure assembly coupled to the filler neck. The nozzle inhibitor is included in the filler neck closure assembly. 
         [0006]    In illustrative embodiments, the nozzle inhibitor includes a flapper door lock comprising rotatable first and second lock rings arranged to rotate about a central axis extending through the filler neck closure assembly. Each lock ring is formed to include door-motion blockers extending inwardly from a frame ring and a plurality of tab-passing slots arranged circumferentially between the door-motion blockers. When both the first lock ring and the second lock ring are moved to an unlocked position, the slots of each lock ring are aligned with each other so that retainer tabs included in a flapper door can pass through the slots as the flapper door moves from a closed position blocking a small-diameter unleaded fuel nozzle from being inserted past the flapper door to an opened position allowing a large-diameter diesel fuel nozzle to be inserted past the flapper door. 
         [0007]    In illustrative embodiments, the nozzle inhibitor also includes a door lock opener comprising a first set and a second set of band movers that are mounted on a guide housing for independent pivotable movement relative to one another. Actuation of the first set of band movers by a fuel nozzle pushing the band movers outwardly causes the first lock ring to pivot to the unlocked position and actuation of the second set of band movers by a fuel nozzle pushing the band movers outwardly causes the second lock ring to pivot to the unlocked position. Only a large-diameter (diesel) fuel-dispensing nozzle can actuate both the first and second set of band movers included in the door lock opener. A relatively smaller small-diameter (unleaded) fuel-dispensing nozzle, in contrast, is not wide enough at the tip to actuate (spread apart) both the first and second set of band movers included in the door lock opener. As such, the door-motion blockers continue to engage (i.e., confront) the retainer tabs of the flapper door to retain the flapper door in a closed position blocking passage of the small-diameter nozzle through the filler neck closure assembly past the flapper door so that unleaded fuel cannot be dispensed into the diesel fuel tank. 
         [0008]    Additional features of the disclosure will become apparent to those skilled in the art upon consideration of the following detailed description of illustrative embodiments exemplifying the best mode of carrying out the disclosure as presently perceived. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]    The detailed description particularly refers to the following figures in which: 
           [0010]      FIG. 1  is a perspective view of a diesel-engine vehicle provided with a capless fuel tank fill tube showing an outer filler neck access door moved to an opened position relative to a vehicle body panel to expose an illustrative capless filler neck closure assembly coupled to a filler neck (shown in phantom) leading to a vehicle fuel tank (also shown in phantom), showing a large-diameter (diesel) fuel-dispensing nozzle coupled to a diesel fuel supply and configured to be inserted into the filler neck closure assembly during vehicle refueling to discharge liquid diesel fuel into the filler neck leading to the vehicle fuel tank, and showing a small-diameter (unleaded) fuel-dispensing pump nozzle that is not authorized for use to refuel the diesel-engine vehicle fuel tank; 
           [0011]      FIG. 2  is a diagrammatic view of a filler neck closure assembly in accordance with the present disclosure showing that an unleaded fuel nozzle inhibitor is located in a fuel tank fill tube and formed to include a movable flapper door, a flapper door lock, and a door lock opener and suggesting that the unleaded fuel nozzle inhibitor is configured to provide inhibitor means for preventing insertion of a small-diameter unleaded fuel-dispensing pump nozzle into a fuel-conducting passageway formed in a filler neck included in the fuel tank fill tube and coupled to a vehicle fuel tank while allowing insertion of a large-diameter diesel fuel-dispensing pump nozzle into the fuel-conducting passageway formed in the filler neck; 
           [0012]      FIG. 3  is an exploded perspective assembly view of an illustrative fill tube and of an illustrative filler neck closure assembly showing that the filler neck closure assembly includes a nozzle inhibitor, a capless outer closure, and a closure housing sized to receive both the fuel nozzle inhibitor and the capless outer closure and showing that the nozzle inhibitor includes a movable flapper door, a flapper door lock, and a door lock opener; 
           [0013]      FIG. 4  is an exploded perspective assembly view of the illustrative fuel nozzle inhibitor included in  FIG. 3  showing that the movable flapper door includes a door plate adapted to be coupled to a lower mount to pivot about a nozzle-inhibitor door axis, a first door position retainer having a pair of retainer tabs, and a second door-position retainer having a pair of retainer tabs, showing that the flapper door lock includes a first lock ring, a second lock ring, a first ring position changer having a first ring rotator and a first wire band, and a second ring position changer having a second ring rotator and a second wire band, and showing that the door lock opener includes a first set of band movers adapted to be coupled to an upper mount to pivot relative to the upper mount to push the first wire band included in the first ring rotator outwardly in response to insertion of a large-diameter diesel fuel nozzle into the fuel nozzle inhibitor, as shown in  FIGS. 7 and 8 , and a second set of band movers adapted to be coupled to an upper mount to pivot relative to the upper mount to push the second wire band included in the second ring rotator outwardly in response to insertion of a large-diameter (diesel) fuel nozzle into the fuel nozzle inhibitor as shown in  FIGS. 7 and 8 ; 
           [0014]      FIG. 4A  is a perspective view of the illustrative fuel nozzle inhibitor shown in  FIG. 4  assembled to show that the band movers included in the door lock opener extend inwardly from the wire bands included in the door lock into a nozzle receiving space defined by the wire bands; 
           [0015]      FIG. 5  is a perspective view of the filler neck closure assembly and a tip of a large-diameter (diesel) fuel-dispensing nozzle above the filler neck closure assembly, with portions of the filler neck closure assembly cut away to show a flapper door of the capless outer closure in a closed position and to show the flapper door lock of the fuel nozzle inhibitor in a locked arrangement blocking movement of the flapper door included in the fuel nozzle inhibitor from the closed position toward an open position; 
           [0016]      FIG. 5A  is a sectional view taken along line  5 A- 5 A of  FIG. 5  showing the arrangement of first and second lock rings included in the flapper door lock each in a locked position in which slots in the first and second lock rings are not aligned; 
           [0017]      FIG. 6  is a view similar to  FIG. 5  of the fuel nozzle closure assembly and a tip of a large-diameter (diesel) fuel nozzle inserted a short distance into the filler neck closure assembly to show the flapper door of the capless outer closure moved to an open position prior to engagement of the large-diameter (diesel) fuel nozzle with the first and second sets of band movers included in the door lock opener as shown in  FIG. 6 ; 
           [0018]      FIG. 6A  is a sectional view taken along line  6 A- 6 A of  FIG. 6  showing the arrangement of first and second lock rings included in the flapper door lock each in a locked position in which slots in the first and second lock rings are not aligned; 
           [0019]      FIG. 7  is a view similar to  FIGS. 5 and 6  of the fuel nozzle closure assembly and a tip of a large-diameter (diesel) fuel nozzle inserted further into the filler neck closure assembly than in  FIG. 6  to show engagement of the large-diameter (diesel) fuel nozzle with sloped ramps formed by the first and second sets of band movers and urge the band movers to slide in radially outward directions to expand the elastic deformable first and second wire bands and cause the companion ring rotators to move so as to rotate the lock rings to unlock the flapper door lock by aligning slots in the first and second lock rings as shown in  FIG. 7A  which allows retainer tabs included in the flapper door to pass through the door lock during movement of the flapper door from the closed position to the open position as shown in  FIG. 8 ; 
           [0020]      FIG. 7A  is a sectional view taken along line  7 A- 7 A of  FIG. 7  showing the arrangement of the first and second lock rings included in the flapper door lock each in an unlocked position in which slots in the first and second lock rings are aligned to provide a channel through which retainer tabs coupled to the flapper door can pass during movement of the flapper door from the closed position to the open position; 
           [0021]      FIG. 8  is a view similar to  FIGS. 5-7  of the fuel nozzle closure assembly and a tip of a large-diameter (diesel) fuel nozzle inserted through the filler neck closure assembly to show the flapper door of the nozzle inhibitor moved to an open position by the large-diameter (diesel) fuel nozzle pushing the flapper door downwardly so that the retainer tabs included in the door-position retainers are moved through the aligned slots in the first and second lock rings allowing the large-diameter (diesel) nozzle to dispense fuel into a fuel tank; and 
           [0022]      FIG. 8A  is a sectional view taken along line  8 A- 8 A of  FIG. 8  showing that the arrangement of the first and second lock rings included in the flapper door lock remain in the unlocked position with the slots in the first and second lock rings aligned to provide a channel through which retainer tabs coupled to the flapper door can pass during movement of the flapper door from the open position to the closed position upon withdrawal of the large-diameter (diesel) nozzle. 
       
    
    
     DETAILED DESCRIPTION 
       [0023]    A nozzle inhibitor  10  is adapted to be mounted in a filler neck  12  to prevent use of a small-diameter (unleaded) fuel-dispensing nozzle  20  in a diesel-engine vehicle  18  as suggested in  FIGS. 1 and 2 . Nozzle inhibitor  10  is configured to block insertion of small-diameter (unleaded) fuel-dispensing nozzle  20  into filler neck  12  past nozzle inhibitor  10  so that a user cannot dispense non-diesel unleaded fuel into diesel-engine vehicle  18 . Nozzle inhibitor  10  is further configured to allow insertion of a large-diameter (diesel) fuel-dispensing nozzle  22  into filler neck  12  past nozzle inhibitor  10  so that a user can dispense diesel fuel into diesel-engine vehicle  18 . Nozzle inhibitor  10  is also suitable for use in a traditional fill tube closed by a fuel (gas) cap. 
         [0024]    As shown diagrammatically in  FIG. 2 , a filler neck closure assembly  11  includes a capless outer closure  15  and nozzle inhibitor  10  which are both mounted in filler neck  12  to provide a capless fill tube  100 . Capless filler neck  12  forms a nozzle-receiving passageway  12 P that communicates with a vehicle fuel tank  14 . Capless outer closure  15  provides an initial covering for filler neck  12  and is adapted to block dirt and other foreign objects from entering filler neck  12 . Nozzle inhibitor  10  prevents a fuel-purchasing customer from using a small-diameter (unleaded) fuel-dispensing nozzle  20  to discharge unleaded fuel into a vehicle  18  having a diesel engine (not shown) requiring only diesel fuel. 
         [0025]    Small-diameter (unleaded) nozzle  20  is coupled to an unleaded fuel supply  19  by a hose  21 . Large-diameter (diesel) nozzle  22  is coupled to a diesel fuel supply  119  by another hose  121 . In many cases, both nozzles  20 ,  22  will be available at a filling station. Nozzle inhibitor  10  in filler neck closure assembly  11  in vehicle  18  functions to block a consumer from inadvertently using small-diameter (unleaded) nozzle  20  to discharge unleaded fuel into a fuel tank filler neck of a vehicle that uses only diesel fuel. 
         [0026]    Nozzle inhibitor  10  illustratively includes a flapper door  30 , a door lock  60 , and a lock opener  90  as shown diagrammatically in  FIG. 2  and illustratively in  FIGS. 3 and 4 . Flapper door  30  is mounted for movement relative to the filler neck  12  from a closed position blocking nozzle-receiving passageway  12 P, as shown in  FIG. 7 , to an open position opening nozzle-receiving passageway  12 P as shown in  FIG. 8 . Door lock  60  moves from a locked position arranged to block movement of flapper door  30 , as shown in  FIGS. 5 and 6 , to an unlocked position arranged to allow movement of flapper door  30  as shown in  FIGS. 7 and 8 . Door lock opener  90  moves door lock  60  from the locked position to the unlocked position in response to insertion of large-diameter (diesel) nozzle  22  into filler neck  12  as shown in  FIG. 7 . 
         [0027]    Flapper door  30  is mounted for movement between a closed position blocking entry of a fuel-dispensing nozzle into filler neck  12  past nozzle inhibitor  10  and an opened position allowing entry of a fuel-dispensing nozzle into filler neck  12  past nozzle inhibitor  10  as shown in  FIG. 8 . Flapper door  30  includes a pivotable spring-biased door plate  32 , a first door position retainer  40 , and a second door position retainer  50  as shown in  FIG. 3 . Door plate  32  is mounted to pivot on an axle  34  about a door axis  32 A and is urged normally to the closed position by a spring  36 . First door position retainer  40  is coupled to an outer portion  33  of the door plate  32  and is formed to include upright first and second retainer tabs  41 ,  42  coupled to a first tab-support ring  45 . Second door position retainer  50  is also coupled to outer portion  33  of the door plate  32  and is formed to include upright third and fourth retainer tabs  53 ,  54  coupled to a second tab-support ring  55  as shown in  FIG. 3 . 
         [0028]    Each illustrative retainer tab  41 ,  42 ,  53 ,  54  has an inverted L-shape as shown in  FIG. 4 . More particularly, each retainer tab  41 ,  42 ,  53 ,  54  is formed to include a corresponding body  411 ,  421 ,  531 ,  541  that extends generally away from door plate  32  and a corresponding arm  412 ,  422 ,  532 ,  542  that extends over door plate  32  as shown in  FIG. 4A . Arms  412 ,  422 ,  532 ,  542  are arrenged to engage flapper door lock  60  when flapper door  30  is closed and flapper door lock  60  is in the locked position blocking movement of flapper door  30  from the closed position to the open position. 
         [0029]    Flapper door lock  60  that is arranged around a central axis  10 A extending through filler neck closure assembly  11  as shown in  FIG. 4 . Flapper door lock  60  includes rotatable first and second lock rings  70 ,  80  positioned to lie above the pivotable spring-biased door plate  32  to interact with the upright first, second, third, and fourth retainer tabs  41 ,  42 ,  53 ,  54  of the door position retainers  40 ,  50 . Each lock ring  70 ,  80  can be rotated through an acute angle about central axis  10 A by a door lock opener  90  in accordance with the present disclosure as suggested by arrows  70 A,  80 A in  FIG. 7A . 
         [0030]    Lock rings  70 ,  80  move between a locked position and an unlocked position. In the locked position, lock rings  70 ,  80  are arranged to block movement of retainer tabs  41 ,  42 ,  53 ,  54  in door position retainers  40 ,  50  to thereby block movement of the door plate  32  from the closed position to the opened position as shown in  FIGS. 5 and 6 . In the unlocked position, lock rings  70 ,  80  are arranged to free each of those retainer tabs  41 ,  42 ,  53 ,  54  to thereby free the pivotable spring-biased door plate  32  to be moved from the closed position to the open position as shown in  FIGS. 7 and 8 . Lock rings  70 ,  80  are moved from the locked position to the unlocked position by a large-diameter (diesel) fuel-dispensing nozzle  22  moving inwardly into filler neck  12  to engage lock opener  90  as shown in  FIGS. 7 and 8 . 
         [0031]    First lock ring  70  is formed to include door-motion blockers  771 ,  772 ,  773 ,  774  extending inwardly from a frame ring  770  as shown in  FIG. 4A . The door-motion blockers  771 ,  772 ,  773 ,  774  are arranged to block the retainer tabs  41 ,  42 ,  53 ,  54  from movement relative to the first lock ring  70  when the first lock ring  70  is arranged in the locked position to thereby block pivotable movement of the door plate  32  to the opened position. First lock ring  70  is also formed to include a first plurality of tab-passing slots  771 S,  772 S,  773 S,  774 S arranged between the door-motion blockers  771 ,  772 ,  773 ,  774  of the first lock ring  70 . First lock ring  70  is further formed to include a mover strut  775  that extends upwardly from frame ring  770  as shown in  FIG. 4A . 
         [0032]    Second lock ring  80  is formed to include door-motion blockers  871 ,  872 ,  873 ,  874  extending inwardly from a frame ring  870  as shown in  FIG. 4A . The door-motion blockers  871 ,  872 ,  873 ,  874  are arranged to block retainer tabs  41 ,  42 ,  53 ,  54  when second lock ring  80  is arranged in the locked position to block pivotable movement of door plate  32  to the opened position. Second lock ring  80  is also formed to include a second plurality of slots  871 S,  872 S,  873 S,  874 S arranged between door-motion blockers  871 ,  872 ,  873 ,  874  of second lock ring  80 . Second lock ring  80  is further formed to include a mover strut  875  that extends upwardly from frame ring  870  as shown in  FIG. 4A . 
         [0033]    When both first lock ring and second lock ring  70 ,  80  are moved to the unlocked position, first and second plurality of slots  771 S- 774 S,  871 S- 874 S are aligned with each other as shown in  FIGS. 7A and 8A . First and second plurality of tab-passing slots  771 S- 774 S,  871 S- 874 S cooperate to provide means for providing channels through which the retainer tabs  41 ,  42 ,  53 ,  54  can pass without engaging any of door-motion blockers  771 - 774  and  871 - 874  after first and second lock rings  70 ,  80  are rotated to assume the unlocked positions to free door plate  32  in the flapper door  30  to be moved from the closed position to the opened position 
         [0034]    Flapper door lock  60  further includes a first ring position changer  61  and a second ring position changer  62  as shown in  FIG. 4 . First ring position changer  61  is coupled to first lock ring  70  and second ring position changer  62  is coupled to second lock ring  80  to move the lock rings  70 ,  80  from the locked position to the unlocked position when a large-diameter (diesel) nozzle  22  is inserted into nozzle inhibitor  10  as shown in  FIGS. 7 and 8 . 
         [0035]    First ring position changer  61  comprises an elastic deformable first wire band  610 , a first band anchor  612 , and a first ring rotator  614  as shown in  FIG. 4 . Deformable first wire band  610  is expandable to change from a normal undeformed mode to a temporary deformed mode. First band anchor  612  is coupled to one end of the first wire band  610  to support the first wire band  610  for pivotable movement about a first pivot axis  61 A in response to expansion of the first wire band  610  from the undeformed mode to the deformed mode. First ring rotator  614  is coupled to an opposite end of the first wire band  610 . The first ring rotator  614  extends into a slot  776  formed in mover strut  775  included in first lock ring  70  to couple first ring position changer  61  to first lock ring  70  so that first ring rotator  614  imparts rotation to the first lock ring  70  to cause the first lock ring  70 . In response to expansion of the elastic deformable first wire band  610  to assume the temporary deformed mode, the first lock ring  70  rotates about the central axis  10 A in a counterclockwise direction from the locked position to the unlocked position as suggested by arrow  61 A in  FIG. 7A . 
         [0036]    Second ring position changer  62  comprises an elastic deformable second wire band  620 , a second band anchor  622 , and a second ring rotator  624 . Elastic deformable second wire band  620  is expandable to change from a normal undeformed mode to a temporary deformed mode. Second band anchor  622  is coupled to one end of the second wire band  620  to support the second wire band  620  for pivotable movement about a second axis  62 A in response to expansion of the second wire band  620  from the undeformed mode to the deformed mode. Second ring rotator  624  is coupled to an opposite end of the second wire band  620 . The second ring rotator  624  extends into a slot  876  formed in mover strut  875  included in second lock ring  80  to couple second ring position changer  62  to second lock ring  80  so that second ring rotator  624  imparts rotation to the second lock ring  80 . In response to expansion of the elastic deformable second wire band  620  to assume the temporary deformed mode, the second lock ring  80  rotates about the central axis  10 A in a clockwise direction from the locked position to the unlocked position as suggested by arrow  62  in  FIG. 7A . 
         [0037]    Door lock opener  90  is arranged to extend into a nozzle-receiving space  10 S provided between the elastic deformable first and second wire bands  610 ,  620  included in flapper door lock  60  as shown in  FIG. 4A . The door lock opener  90  includes a first set  91  of three band movers  911 ,  912 ,  913  that are mounted on an upper mount  210  for independent pivotable movement relative to one another and to the first wire band  610 . The first set  91  of three band movers  911 ,  922 ,  913  are configured to expand the first wire band  610  to the temporary deformed mode to move the first ring rotator  614  relative to filler neck  12  to rotate the first lock ring  70  about central axis  10 A in the counterclockwise direction from the locked position to the unlocked position in response to movement of large-diameter fuel-dispensing nozzle  22  in filler neck  12  into nozzle-receiving space  10 S. 
         [0038]    The door lock opener  90  also includes a second set  92  of three band movers  921 ,  922 ,  923  that are mounted on upper mount  210  for independent pivotable movement relative to one another and to the second wire band  620 . The second set  92  of three band movers  921 ,  922 ,  923  are configured to expand the second wire band  620  to the temporary deformed mode to move the second ring rotator  624  relative to filler neck  12  to rotate the second lock ring  80  about central axis  10 A in the clockwise direction from the locked position to the unlocked position in response to movement of large-diameter fuel-dispensing nozzle  22  in filler neck  12  into nozzle-receiving space  10 S. 
         [0039]    In the illustrative embodiment, each band mover  911 ,  912 ,  913 ,  921 ,  922 ,  923  forms a corresponding pivot shaft  911 S,  912 S,  913 S,  921 S,  922 S,  923 S, band-receiving notch  911 N,  912 N,  913 N,  921 N,  922 N,  923 N, and sloped ramp  911 R,  912 R,  913 R,  921 R,  922 R,  923 R as shown in  FIG. 4A . Each pivot shaft  911 S,  912 S,  913 S,  921 S,  922 S,  923 S is received in coupled to upper mount  210  to support a corresponding band mover pivot shaft  911 S,  912 S,  913 S,  921 S,  922 S,  923 S for movement relative to the upper mount  210 . Each band-receiving notch  911 N,  912 N,  913 N,  921 N,  922 N,  923 N faces away from the central axis  10 A and is sized to receive a portion of the first or second wire band  610 ,  620 . Each sloped ramp  911 R,  912 R,  913 R,  921 R,  922 R,  923 R extends inwardly in a radial direction from the upper mount  210  toward the central axis  10 A and downwardly toward the movable flapper door  30 . 
         [0040]    Capless outer closure  15  illustratively includes a capless plate  220  coupled to the upper mount  210  to pivot from a closed position to an open position about a plate axis  220 A as shown in  FIGS. 3 and 5 . In the closed position, capless plate  220  extends over an entry aperture  12 A formed by the filler neck  12  and blocks dirt from entering filler neck  12  as suggested in  FIG. 5 . In the closed position, capless plate  220  is pushed into passageway  12 P, as shown in  FIG. 6 , and allows a large-diameter (diesel) nozzle  22  to engage nozzle inhibitor  10  to unlock/open nozzle inhibitor  10  so that the large-diameter (diesel) nozzle  22  can dispense diesel fuel into fuel tank  14  as suggested in  FIG. 8 . Capless plate  220  is mounted to pivot on an axle  224  and is urged normally to the closed position by a spring  226 . In other embodiments, capless outer closure  15  is replaced by a traditional threaded fill tube closed by a corresponding threaded fuel (gas) cap. 
         [0041]    Filler neck closure assembly  11  further includes upper mount  210  and lower mount  212  as shown in  FIG. 3 . Upper mount  210  extends around central axis  10 A and supports band movers  911 ,  912 ,  913 ,  921 ,  922 ,  923  for movement about their respective axes relative to filler neck  12 . Lower mount  212  extends around central axis  10 A and supports flapper door  30  for movement between the closed position and the open position. 
         [0042]    Filler neck closure assembly  11  further includes a closure housing  214  as shown in  FIG. 3 . Closure housing  214  receives and supports nozzle inhibitor  10 , capless outer closure  15 , upper mount  210 , and lower mount  212  as suggested in FIGS.  3  and  5 - 8 . Closure housing  214  is adapted to be mounted in filler neck  12  to hold nozzle inhibitor  10  and capless outer closure  15  in a predetermined position relative to filler neck  12 . Closure housing  214  illustratively includes an upper sleeve  216  and a lower sleeve  218  that mates with upper sleeve  216 . 
         [0043]    Upper sleeve  216  included in closure housing  214  includes a mouth ring  230 , a side wall  232  that extends down from mouth ring  230 , and a plurality of tabs  241 ,  242 ,  243 ,  244  as shown in  FIG. 3 . Mouth ring  230  extends around an entry aperture  231  through which a nozzle moves to enter filler neck  12 . Plurality of tabs  241 ,  242 ,  243 ,  244  extend outwardly from side wall  232  and are received in slots  251 ,  252 ,  253 ,  254  formed in filler neck  12  when filler neck closure assembly  11  is inserted into filler neck  12  so that filler neck closure assembly  11  is held in place relative to filler neck  12 . 
         [0044]    Only a large-diameter (diesel) fuel-dispensing nozzle  22  can actuate door lock opener  90  in accordance with the present disclosure to pivot first wire band  610  coupled to first lock ring  70  in a counterclockwise direction and to pivot second wire band  620  coupled to second lock ring  80  in a clockwise direction. Rotation of both first lock ring  70  and second lock ring  80  causes first and second plurality of slots  771 S- 774 S,  871 S- 874 S formed in the lock rings  70 ,  80  to align so that retainer tabs  41 ,  42 ,  53 ,  54  can move past flapper door lock  60  and flapper door  30  can be moved from the closed position to the opened position to thereby allow passage of large-diameter fuel-dispensing nozzle  22  past an opened flapper door  30  toward fuel tank  14 . 
         [0045]    The dual-action flapper door lock  60  prevents a relatively smaller-diameter (unleaded) fuel-dispensing nozzle  20  from tricking the flapper door lock  60  into unlocking The relatively smaller small-diameter (unleaded) fuel-dispensing nozzle  20  is not wide enough at the tip to spread apart all of the band movers  911 ,  912 ,  913 ,  921 ,  922 ,  923  included in the door lock opener  90  to expand each of first and second wire bands  610 ,  620  in flapper door lock  60  and cause door-motion blockers  771 - 774 ,  871 - 874  to free door-position retainer tabs  41 ,  42 ,  53 ,  54  included in the flapper door  30 . As such, door-motion blockers  771 - 774 ,  871 - 874  continue to block (i.e., confront) the door-position retainer tabs  41 ,  42 ,  53 ,  54  to retain flapper door  30  in a closed position blocking passage of small-diameter nozzle  20  through filler neck closure assembly  11  and admission of small-diameter nozzle  20  past nozzle inhibitor  10  toward fuel tank  14 .