Evaporative Emission Control Canister: Description and Operation

Fig. 53 Charcoal canister w/purge control valve:

WITH PURGE CONTROL VALVE

The carbon canister stores fuel vapors from the fuel tank and carburetor until the engine is started. Fuel vapors enter the top of the purge side of the canister, Fig. 53, and travel in a ``U'' shape pattern to the fresh air vent side. Vapor flow to the engine is controlled by the purge control valve.

Fig. 54 Charcoal canister less purge control valve:

WITHOUT PURGE CONTROL VALVE

The carbon canister, Fig. 54, stores fuel vapors from the fuel tank and carburetor bowl until the engine is started. At this time, fuel vapors are purged from the canister into the engine for combustion. Depending on application, either a 925ml or 1400ml canister is used.

On vehicles equipped with a dual canister system, two canisters are linked together and the second canister is used for ``spill over'' fuel vapors.