Evaporative Emission Control Canister: Description and Operation

EVAP Canister (Typical) Operation:

PURPOSE
The charcoal canister contains activated charcoal granules which absorb and store fuel vapors until they can be consumed during combustion.

OPERATION
The fuel resistant nylon body of the canister contains activated charcoal granules which absorb and store fuel vapors until they are drawn into the induction system to be burned along with the normal air/fuel mixture. During engine operation outside air is drawn into the canister through a filter pad located at the bottom of the canister. The stored vapors are drawn out of the canister into the incoming airstream where they are consumed during combustion.