| 摘要 |
PURPOSE:To prevent percolation in the carburetor in such a way that when stopping the engine, outer air is sucked in a float chamber, and fuel vapor is forcibly feed into a canister. CONSTITUTION:A solenoid valve 17 which is opened only in case of electric conduction to a solenoid 16, and has the float chamber 5 communicated to the outside is provided at the upper part of a float chamber 5, and a fan 20 to forcibly feed pressurized air by driving a motor 19 to the canister 11 is provided on the way to the path 10. In case where temperature on the float wall is high, and fuel vapor is produced in a large quantity, a temperature sensor 25 is turned on, and set by a timer 24, and the fan 20 is driven by electric conduction of the motor 19 for the determined time, at the same time, the solenoid valve 17 is opened by the electric conduction of the solenoid 16, and communication to the outside is set up. Thus, air from the outside is forcibly introduced through the upper part of the fuel in the float chamber 5 into the side of the canister 11.
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