Evaporative Emission Control Canister: Description and Operation

EVAPORATIVE EMISSION CANISTER
The evaporative (EVAP) emission canister is an emission control device containing activated charcoal granules. The EVAP emission canister is used to store fuel vapors from the fuel tank. Once certain conditions are met, the powertrain control module (PCM)/engine control module (ECM) activates the EVAP canister purge solenoid, allowing the fuel vapors to be drawn into the engine cylinders and burned.