APPARATUS FOR VENTING FUEL VAPORS

摘要

8765 APPARATUS FOR VENTING FUEL VAPORS Harvey L. Ruth Larry J. Tipton Apparatus for venting fuel vapors present in the fuel bowl of a carburetor for an internal combustion engine comprises a bowl vent through which fuel vapors discharge when the vent is open. A valve opens and closes the vent. A biasing force is exerted on the valve to close the vent. In response to starting of the engine first and second opening forces are exerted on the valve; these forces being sufficient to overcome the biasing force exerted thereon and open the vent. Each vent opening force is independently sufficient to open the vent and the vent is open when the engine is running even if one of the first and second forces is not exerted on the valve or is insufficient to open the valve.