초록 ▼

A fuel tank sealing system for a fuel tank filler tube is disclosed in which the fuel system is sealed when the fuel cap is not installed, or improperly installed and allows pressure equalization during the insertion of a refueling nozzle. A vent valve is first actuated by partial insertion of the n

A fuel tank sealing system for a fuel tank filler tube is disclosed in which the fuel system is sealed when the fuel cap is not installed, or improperly installed and allows pressure equalization during the insertion of a refueling nozzle. A vent valve is first actuated by partial insertion of the nozzle and allows pressure equalizing flow to bypass the refueling nozzle. A flap valve is then actuated by complete insertion of the refueling nozzle to allow fuel to enter the fuel tank.

대표청구항 ▼

[ We claim:] [1.] A fuel tank sealing system for a fuel tank filler tube comprising:a fuel tank filler tube having a generally uniform cylindrical cross-section; an upper portion of the fuel tank filler tube adapted to be connected to a fuel cap and adapted to communicate with atmosphere when the ca

[ We claim:] [1.] A fuel tank sealing system for a fuel tank filler tube comprising:a fuel tank filler tube having a generally uniform cylindrical cross-section; an upper portion of the fuel tank filler tube adapted to be connected to a fuel cap and adapted to communicate with atmosphere when the cap is removed;a lower portion of the fuel tank filler tube communicating with a fuel tank;a biased closed vent valve located in the fuel tank filler tube between said upper portion and said lower portion, said vent valve adapted to be actuated by a refueling nozzle so as to also allow vapor flow between said upper portion and said lower portion of the fuel tank filler tube; anda biased closed flap valve located in the fuel tank filler tube between said upper portion and said lower portion, said flap valve adapted to be actuated by the refueling nozzle so as to allow fuel flow between said upper portion and said lower portion of the fuel tank filler tube only after said vent valve is actuated by the refueling nozzle, thereby achieving pressure equalization before said refueling nozzle actuates said flap valve.