Patent ID: 6959696

Claim:
A self-purging evaporative emission control system for an internal combustion engine, the engine having an operating condition and a non-operating condition, the system comprising: an engine intake assembly that provides intake air to the engine, the intake assembly including a throttle valve and a venturi portion upstream of the throttle valve; an evaporative emission device including fuel vapor adsorbing material; a fuel tank that provides fuel to the engine; a vent conduit providing fluid communication between the fuel tank and the evaporative emission device and conducting fuel vapor from the fuel tank to the evaporative emission device at least when the engine is in the non-operating condition; an atmospheric vent providing fluid communication between the evaporative emission device and the atmosphere; and a vapor conduit providing fluid communication between the evaporative emission device and the engine intake assembly and conducting fuel vapor from the evaporative emission device to the engine intake assembly in response to a decrease in pressure in the engine intake assembly when the engine is in the operating condition, the vapor conduit communicating with the engine intake assembly upstream of the venturi portion.