Diagnostic Aids
Use EVAP pressure/purge diagnostic cart and ultrasonic leak detector to locate a small leak. Possible causes of a small leak are:
- Fuel cap leaking.
- EVAP vent solenoid stuck open.
- EVAP vent hose loose or damaged.
- EVAP canister leaking.
- Fuel sender assembly "O" ring leaking.
- Fuel tank or filler neck leaking.
Small leak diagnostic can detect a leak as small as 0.02" (0.5 mm).