Apparatus for venting fuel vapors

摘要

Apparatus for venting fuel vapors present in the fuel bowl of a carburetor for an internal combustion engine. A carburetor has at least one air passage through which air is drawn into the engine, a throttle valve positioned in the air passage and movable between an open and a closed position to control the flow of air therethrough, a fuel circuit by which fuel is delivered from the fuel bowl to the air passage for mixing with air passing therethrough, and means responsive to the movement of the throttle valve for controlling the quantity of fuel delivered through the fuel circuit. A fuel bowl cover has a vent through which fuel vapors discharge when the vent is open and a valve opens and closes the vent. A fuel pump supplies fuel from the fuel bowl to the air passage as the throttle valve opens and moves the valve to a vent opening position in response to the movement of the throttle valve. The pump is actuated as the throttle valve opens whereby the valve is opened and vapors in the fuel bowl are vented.