The charcoal canister is part of the Evaporative Emission Control System. This system prevents the escape of raw gasoline vapors from the fuel tank and carburetor.
The charcoal canister is designed to absorb fuel vapors under certain conditions. For a more detailed description, see Emission Controls .
The canister is a coffee can-sized object located in the engine compartment. Label the hoses leading to the canister before disconnecting them, then, remove the old canister from its mounting bracket and discard it. Install the new canister and connect the hoses as before.
Maintenance on the canister consists of testing and inspection at 12,000 mile intervals (1973-74 models), 15,000 mile intervals (1975-80 models) and replacement at 24,000 miles (1973-74 models) or 30,000 miles (1975-80 models). On the 1981-83 models, the canister does not require periodic replacement. The entire system requires a careful operational check with a vacuum gauge at 60,000 miles. See Emission Controls for testing procedures.