EVAP leak attributed to a loose or missing fuel filler cap.
SYMPTOMS
- Check-engine light
- Occasional fuel odor
LIKELY CAUSES
- Loose or faulty gas cap
- Cracked or disconnected EVAP hose
- Stuck purge or vent valve
- Failed charcoal canister
DIAGNOSIS STEPS
- Check the gas cap seal
- Smoke-test the EVAP system
- Test purge and vent valve operation
- Inspect the charcoal canister and hoses
RELATED PARTS
- Gas cap