Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1981 Subaru GLF Automatic TransFACTORY OEM SERVICE PROCEDURE
System Test
- With gas cap removed, disconnect evaporative hose between carbon canister and fuel tank. Blow air toward carbon canister, no resistance should be felt. Blow air toward fuel tank, slight resistance should be felt because of the two-way valve.
- Disconnect the vacuum hose from the pipe going to the carbon canister vacuum vent port. Blow air into the hose. If air can be blown into the canister, the diaphragm in the purge control valve is ruptured and the canister must be replaced.
- Blow air into all other ports on the carbon canister. If air does not pass easily through all other hoses, replace canister.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.