Refueling vapor recovery system with differential pressure valve

A fuel vapor control apparatus comprising:

• a fuel tank;
• a filler pipe having one end connected with said fuel tank and another end cooperable with a filler cap;
• a canister for adsorbing fuel vapor generated in said fuel tank;
• a fuel vapor control valve disposed in a passage that allows communication between said fuel tank and the canister and divided into an upper chamber and a lower chamber, said fuel vapor control valve being opened or closed due to a difference in pressure between the upper chamber and the lower chamber;
• a fuel drop passage allowing communication between said upper chamber and said lower chamber;
• and
• a line connecting an inside of said upper chamber with a portion close to an end of said filler pipe near the filler cap,
• wherein said fuel vapor control valve is provided with a diaphragm portion made of a flexible material and a diaphragm holder having an umbrella portion and coupled to said diaphragm portion to move integrally therewith, said umbrella portion closing said fuel drop passage at the time of fuel supply and wherein said fuel drop passage is composed of a communication hole formed in said diaphragm portion.

A fuel vapor control apparatus comprising:

• a fuel tank;
• a filler pipe having one end connected with said fuel tank and another end cooperable with a filler cap;
• a canister for adsorbing fuel vapor generated in said fuel tank;
• a fuel vapor control valve disposed in a passage that allows communication between said fuel tank and the canister and divided into an upper chamber and a lower chamber, said fuel vapor control valve being opened or closed due to a difference in pressure between the upper chamber and the lower chamber;
• a fuel drop passage allowing communication between said upper chamber and said lower chamber;
• and
• a line connecting an inside of said upper chamber with a portion close to an end of said filler pipe near the filler cap,
• wherein said fuel vapor control valve is provided with a diaphragm portion having a check valve that closes said fuel drop passage at the time of fuel supply and wherein said fuel drop passage is composed of a communication hole formed in said diaphragm portion.