Evaporative emission canister purge actuation monitoring system having an integrated fresh air filter

摘要

An evaporative emission canister purge actuation monitoring system includes an integrated valve body having a main flow passage, and an air filter assembly disposed adjacent the valve body and providing fluid communication between the main flow passage and the ambient air. A first one-way umbrella valve mounted to the valve body that is responsive to predetermined positive pressure in the main flow passage to control flow of fluid from a vapor canister to ambient air as well as a second one-way umbrella valve that is responsive to a predetermined negative pressure in the main flow passage to control the flow of ambient air through a fresh air port.