Probable Causes
Probable causes are:
- Fuel filler cap improperly tightened or missing.
- Improper fuel cap relief pressure.
- Fuel overflow limiter valve failed.
- Purge line or vapor line blocked.
- Leak in fuel tank, purge line or vapor line.
- Purge solenoid failed.
- Ventilation solenoid failed.
- Fuel Tank Differential Pressure (FTDP) sensor failed.
- Leak in EVAP canister.
- EVAP canister clogged.