P1331 – Fuel Tank Pressure Too High
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Symptoms
- Fuel smell
- Hissing when opening cap
- Check engine light
Causes
- Blocked vent
- Faulty EVAP vent valve
- Restricted canister
Diagnosis
- Read tank pressure
- Test vent valve
- Inspect EVAP lines
Repair
- Repair or replace vent valve
- Clear blockages
- Service EVAP system