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A device for preventing an outflow of a fuel vapor from a fuel tank comprising a breather pipe which connects the upper interior of the fuel tank to a charcoal canister. A float-valve assembly is mounted on the upper wall of the fuel tank. This assembly comprises a breather passage connected to the

A device for preventing an outflow of a fuel vapor from a fuel tank comprising a breather pipe which connects the upper interior of the fuel tank to a charcoal canister. A float-valve assembly is mounted on the upper wall of the fuel tank. This assembly comprises a breather passage connected to the charcoal canister via the breather pipe, a normally closed solenoid valve arranged in the breather passage, and a float normally allowing the breather passage to be open to the interior of the fuel tank. When the replenishment of the fuel tank is carried out, the solenoid valve is opened to feed fuel vapor in the fuel tank into the charcoal canister.

대표청구항 ▼

A device for preventing fuel vapor from escaping into the outside air from a fuel tank, said device comprising: a fuel vapor purifying apparatus; a float-valve assembly mounted on an upper wall of the fuel tank and having therein a breather passage which is open to an upper interior of the fuel tank

A device for preventing fuel vapor from escaping into the outside air from a fuel tank, said device comprising: a fuel vapor purifying apparatus; a float-valve assembly mounted on an upper wall of the fuel tank and having therein a breather passage which is open to an upper interior of the fuel tank at one end and is connected to an upper interior of the fuel tank at one end and is connected to said fuel vapor purifying apparatus at the other end, said float-valve assembly having a normally closed solenoid valve which is arranged in said breather passage and having a float which operates with said one end of said breather passage and closes said one end of said breather passage when the level of a surface of fuel in the fuel tank exceeds a predetermined level; and control means for determining whether said solenoid valve is to be opened and opening said solenoid valve when said solenoid valve is to be opened, said control means comprising an ignition switch and a control switch, said control switch being operated when replenishment of the fuel tank is to be carried out, and said solenoid valve being opened when said ignition switch is off and when said control switch is operated.