See Figures 1 and 2
The function of the Evaporative Control System is to prevent gasoline vapors from the fuel tank from escaping into the atmosphere. Periodic maintenance is required only on 1981-82 models (all other vehicles have a sealed, maintenance-free charcoal canister). The fiberglass filter on the bottom of the canister must be replaced on these models, but only if the vehicle is driven under very dusty conditions.
To replace the filter:
- Note the locations of the hoses going to the canister, then disconnect them.
- Loosen the canister hold-down clamp, then lift the canister out of the mounting bracket.
- Invert the canister, then remove the bottom of the canister.
- Pull the used filter out of the canister.
- Insert the new filter into the bottom of the canister so that it sits flat.
- Attach the bottom cover onto the canister, then position the canister in its mounting bracket.
- Secure the canister in place with the hold-down clamp, then attach the hoses to the applicable ports on the canister.
In spite of the fact that this system requires no periodic maintenance, it is a good idea to quickly look over the hoses when servicing the PCV system. If any of these hoses appears cracked, torn, or rotted, the result could be vacuum leaks, poor engine operation or the annoying smell of fuel vapor. If any of these hoses should require replacement, make sure to use a high quality replacement hose of a material approved for use in fuel bearing applications. Ordinary vacuum type rubber hose will not provide satisfactory life or reliable performance.