Patent ID: 6902208

Claim:
A method of forming a gas impermeable joint in a fuel fill system, the method comprising: providing a tube having a metallic barrier layer disposed between an inner plastic layer and an outer plastic layer, the tube and the layers each having a circumference, the outer plastic layer including a shoulder protruding radially outward around at least a portion of its circumference; forcing at least one of the inner plastic layer and the outer plastic layer into contact with a plastic surface of a funnel portion of the fuel fill system, the funnel portion including an outer protrusion portion surrounding a cylindrical recess, the recess being dimensioned to receive an end of the tube, the plastic surface of the funnel portion being formed within the recess to contact the at least one of the inner plastic layer and the outer plastic layer, the plastic surface of the funnel portion also being formed on the outer protrusion portion to contact the shoulder of the outer plastic layer; causing at least one of the inner plastic layer and the outer plastic layer to contact the plastic surface formed within the recess; causing the shoulder of the outer plastic layer to contact the plastic surface formed on the outer protrusion portion; and welding at least one of the at least one of the inner plastic layer and the outer plastic layer and the shoulder of the outer plastic layer with the plastic surface to form the gas impermeable joint.