P1329 – Fuel Return Line Restriction
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Symptoms
- High fuel pressure
- Black smoke
- Poor fuel economy
- Rough idle
Causes
- Kinked return hose
- Blocked line
- Debris in fittings
Diagnosis
- Measure fuel pressure
- Inspect return hose
- Check for kinks or blockage
Repair
- Repair or replace return line
- Clean fittings