Ford Workshop Service and Repair Manuals

The evaporative emission system consists of an evaporative emission canister and an evaporative emission canister purge valve. A combination of plastic lines and rubber hoses connect the evaporative emission canister to the fuel tank and the evaporative emission canister purge valve. The evaporative emission canister purge valve is also connected to the intake manifold.

When the evaporative emission canister purge valve is closed, the fuel tank is vented into the evaporative emission canister through the fuel tank vent valves and the fill limit vent valve. The evaporative emission canister absorbs the fuel vapor and prevents the release of hydrocarbons into the atmosphere. When the evaporative emission canister purge valve is opened, the evaporative emission canister is exposed to the intake manifold vacuum and the fuel vapor deposits are drawn into the manifold where they mix with the incoming air/fuel charge.

The evaporative emission canister purge valve is controlled by the powertrain control module (PCM) in relation to the driving characteristics of the vehicle.