Ford Mid-Size Cars 1971-1985 Repair Guide

Evaporative Emissions Canister


See Figure 1

The vapor, or carbon canister is located in the right front fender of the engine compartment and is part of the evaporative emission control system. This system prevents the emission of harmful fuel vapors into the atmosphere. The canister contains activated charcoal which absorbs the fuel vapors from the fuel tank and carburetor float bowl (if equipped.) The fuel vapors are stored in the canister until the engine is started. Then the vapors are drawn into the engine for burning through a vacuum operated purge valve or solenoid purge valve.

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Fig. Fig. 1: Evaporative emissions system


See Figure 2

Servicing the evaporative canister is only necessary if it becomes clogged or contains liquid fuel. If replacement is necessary, the canister must be replaced as a unit; it cannot be disassembled. For more detailed information on the evaporative emission control system, refer to Emission Controls .

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Fig. Fig. 2: The canister can be found on most mid-sized Ford cars behind the right front fender