Importance

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Abstract

A coupling device for fueling automobile gasoline tanks is disclosed and claimed. The coupling has two parts: a cap assembly (female half) and a nozzle assembly (male half). Little or no spillage occurs due to opposing flush faces of the female main valve and the plug of the male. The cap assembly is affixed to an existing gasoline tank (fuel storage tank) or alternatively can be supplied as original equipment on a new automobile. Fuel vapor is extracted from the automobile fuel tank with high efficiency and returned to the pumping station for storage and/or reprocessing. Vapors and/or liquid fuel are extracted through the portion of the gasoline tank cap assembly which resides within the tank. Apertures in the cap assembly communicate with an annular passageway which removes the vapors to ports which mate with peripheral apertures in a concentric nozzle having an outer sheath and an inner fluid conduit. The gasoline tank cap assembly includes a vent valve for relieving pressure within the tank when necessary. A vent sleeve is also provided for supplying air to the gasoline tank when necessary. A method of recovering fuel vapor from a fuel storage tank is also disclosed and claimed.

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First Claim