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Evaporative Emission (EVAP) Controls Description The evaporative emission controls are designed to minimize the amount of fuel vapor escaping to the atmosphere. The A. Evaporative Emission (EVAP) Canister An EVAP canister is used for the temporary storage of fuel vapor until the fuel vapor can be purged from the EVAP B. Vapor Purge Control System EVAP canister purging is accomplished by drawing fresh air through the EVAP canister and into a port on the throttle C. Fuel Tank Vapor Control System When fuel vapor pressure in the fuel tank is higher than the set value of the EVAP two way valve, the valve opens and regulates the flow of fuel vapor to the EVAP canister. During refueling, the fuel tank vapor control valve opens with the pressure in the fuel tank, and feeds the fuel vapor to the EVAP canister. Main Menu Table of Contents |