What is the purpose of the canister vent valve?
What is the purpose of the canister vent valve? What is the Canister Vent Valve all about? The purpose of the canister vent valve, also called simply the vent valve, is to control the flow of air into and out of the Evaporative Emission Control (EVAP) system, a feature on all modern cars. The EVAP system collects and stores fuel vapors in a charcoal canister. What is the function of a canister purge valve? Function. Canister purge valves are also used in “leak tests,” by allowing a vacuum to be created throughout the fuel storage system when the valve is...