Evaporative Emission (EVAP) Canister

The EVAP canister stores unburned fuel vapors and prevents them from escaping into the atmosphere. The EVAP canister contains a carbon filter bed which holds fuel vapors until they are purged into the intake manifold through the EVAP purge solenoid. Fresh air normally flows though the EVAP vent solenoid to the EVAP canister, then into the fuel tank to keep the fuel tank at atmospheric pressure.