Evaporative Emission Control Canister: Description and Operation

Evaporative Emission System




Duratec Engine




Zetec Engine

Principles of Operation

Evaporative Emission (EVAP) Canister
Fuel vapors from the fuel tank are stored in the EVAP canister. When the engine is running, the vapors are purged from the EVAP canister for combustion. OBD II vehicles sometimes use multiple canisters, which is dependent upon the size and number of the fuel tanks used on a specific vehicle.