Importance

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Abstract

In a vehicle fuel system having a fuel tank with a filler pipe having an upper end closable by a removable cap and opening to the atmosphere when the cap is removed to receive an inserted object and a fuel vapor storage canister, a venting means that allows the cap to be removed while preventing pressurized fuel vapors generated in the tank when the filler pipe is closed from reaching the atmosphere. When the cap is removed, a valve is opened, while a seal means independent of the cap remains closed. Thus, vapors are blocked from the atmosphere, but allowed to exit past the valve to the canister. In addition, the seal means engages a conventionally sized fuel nozzle, providing another seal so that fuel fill vapors are similarly controlled.

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First Claim