Charcoal Canister

Remove and inspect canister. Look for cracks or damage. Check for clogged filter and stuck check valve.
Using low pressure compressed air, blow into tank pipe and check that air flows without resistance from other pipes. If necessary, replace canister.
Clean filter in canister. Clean filter by applying 43 psi (3 kg/cm² ) of compressed air into pipe to outer vent control valve while holding other upper canister pipes closed.
DO NOT attempt to wash canister. Be sure that no activated carbon comes out of canister. Install canister.