Capless closure assembly for fuel-tank filler pipe

A capless fuel filler pipe closure for use in a vehicle, the closure comprising

• a nozzle-insertion housing including an outer aperture, an inner aperture spaced from the outer aperture, and an internal cavity arranged between the outer aperture and the inner aperture,
• an outer flapper door coupled to the nozzle-insertion housing to move from a normally closed position sealing the outer aperture to an opened position upon insertion of a fuel dispensing nozzle through the outer aperture,
• an inner flapper door coupled to the nozzle-insertion housing to move from a normally closed position sealing the inner aperture to an opened position upon insertion of the fuel dispensing nozzle through the inner aperture,
• an overpressure controller including a pressure-activated valve located along an overpressure path through the nozzle-insertion housing that is independent of a primary nozzle-insertion path through the outer aperture, the internal cavity, and the inner aperture, and
• an underpressure controller including a pressure-activated valve located along an underpressure path through the nozzle-insertion housing that is independent of the primary nozzle-insertion path through the outer aperture, the internal cavity, and the inner aperture,
• wherein the nozzle-insertion housing includes an inner section and an outer section coupled to an end of the inner section, the inner section shaped to define an overpressure bypass duct forming a portion of the overpressure path and an underpressure bypass duct forming a portion of the underpressure path, and the overpressure bypass duct and the underpressure bypass duct extend axially relative to an axis of the closure so that the overpressure bypass duct and the underpressure bypass duct are parallel to the primary nozzle-insertion path through the outer aperture, the internal cavity, and the inner aperture.

A capless fuel filler pipe closure for use in a vehicle, the closure comprising

• a nozzle-insertion housing including an outer aperture, an inner aperture spaced from the outer aperture, and an internal cavity arranged between the outer aperture and the inner aperture,
• an outer flapper door coupled to the nozzle-insertion housing to move from a normally closed position sealing the outer aperture to an opened position upon insertion of a fuel dispensing nozzle through the outer aperture,
• an inner flapper door coupled to the nozzle-insertion housing to move from a normally closed position sealing the inner aperture to an opened position upon insertion of the fuel dispensing nozzle through the inner aperture, and
• pressure management means configured to regulate pressure in a fuel filler pipe via venting out/in to the fuel filler pipe through at least one pathway that bypasses the internal cavity of the nozzle-insertion housing so that fuel extant in the internal cavity is not disturbed by venting such that hydrocarbons in the extant fuel remain sealed in the internal cavity during operation of the vehicle,
• wherein the nozzle-insertion housing includes an inner section and an outer section coupled to an end of the inner section, the inner section shaped to define an overpressure bypass duct forming an overpressure path and an underpressure bypass duct forming an underpressure path, and the overpressure bypass duct and the underpressure bypass duct are independent of a primary nozzle-insertion path through the outer aperture, interior cavity, and the inner aperture of the nozzle-insertion housing.