Chevrolet 30020697 Canister,Evap (On Esn)

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On carbureted models, the canister can be tested by blowing air into the ports and checking for proper air flow.

The function of the evaporative emissions control system is to draw fuel vapors from the gas tank and fuel system, store them in a charcoal canister. The charcoal canister functions as a holding tank for fuel vapors-inspect it periodically as indicated in the maintenance schedule. On late-model fuel-injected vehicles equipped with an On-Board Refueling Vapor Recovery (ORVR) system, the charcoal canister is located under the vehicle, on the right side, in front of the fuel tank and route them to the intake manifold during normal engine operation. The most common symptom of a fault in the evaporative emissions system is a strong fuel odor in the engine compartment. If a fuel odor is detected, inspect the charcoal canister and all hoses for damage and deterioration. At the specified intervals, the charcoal canister must be replaced with a new one. Disconnect the hoses, and then unbolt the bracket from the firewall or from the underside of the vehicle. Installation is the reverse of removal. The evaporative emissions control system is explained in more detail in the following.