Evaporative Emission Control Canister: Description and Operation

Fig.1 EVAP Canister:

The canister mounts to a bracket on top of the fuel tank. The vacuum and vapor tube connect to the top of the canister.

All vehicles use a sealed, maintenance free, evaporative (EVAP) canister. Fuel tank pressure vents into the canister. The canister temporarily holds the fuel vapors until intake manifold vacuum draws them into the combustion chamber. The Powertrain Control Module (PCM) purges the canister through the duty cycle EVAP purge solenoid. The PCM purges the canister at predetermined intervals and engine conditions.