Patent ID: 7225798

Claim:
A device combining a fuel control valve and a carbon canister in a hollow can being installed between a fuel tank and a fuel gas inlet of an engine for returning evaporated fuel gas in the fuel tank to the engine, the hollow can comprising a first chamber for installing the fuel control valve and a second chamber to form the carbon canister; the fuel control valve including: a tapered tank and a main valve gate being formed in lower and upper portions of the first chamber, respectively; a trench being formed in the tapered tank; a bottom of the tapered tank being formed with a gas tube communicated to an evaporation chamber in the fuel tank; a gas channel being formed in the main valve gate and being connected to the second chamber; and a movable rolling ball element and a floatable plug element which are installed between the tapered tank and the main valve gate; the floatable plug element being movably installed between the rolling ball element and the main valve gate; and a top end of the floatable plug element being formed with a plug for closing or opening the main valve gate; and the carbon canister including: a plurality of non-woven cloth and active carbon being installed within the second chamber; and at least one gas return tube which is connected to the fuel gas inlet of the engine; thereby the engine operates to form a negative pressure making the evaporated fuel gas flowing from the fuel tank through the gas tube, trench, main valve gate and gas channel to the second chamber of the hollow chamber, and then flowing from the hollow chamber through the gas return tube and the fuel gas inlet to the engine.