Patent ID: 8448629

Claim:
A fuel vapor processing apparatus comprising: a vapor passage capable of introducing fuel vapor into a canister, the fuel vapor being produced within a fuel tank of an automobile: an atmospheric-side opening and closing device provided at the canister; a negative pressure generating device capable of generating a negative pressure; a recovery passage communicating between the negative pressure generating device and the canister, so that fuel vapor stored within the canister can be recovered into the fuel tank through the recovery passage by the operation of the negative pressure generating device; and a vapor passage opening and closing device capable of opening and closing the vapor passage; wherein during recovering of fuel vapor within the canister into the fuel tank by the operation of the negative pressure generating device, when the pressure within the fuel tank is lower than a first predetermined pressure, the atmospheric-side opening and closing mechanism and the vapor passage opening and closing device are closed, and when the pressure within the fuel tank is equal to or higher than the first predetermined pressure, the vapor passage opening and closing device can be opened for releasing gas within the fuel tank toward the canister while the atmospheric-side opening and closing mechanism is closed.