Fuel Leakage Detected
The system has detected a fuel leak in the engine's fuel delivery system.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
In this case, the engine's fuel system is finding fuel leaking somewhere it shouldn't. This can lead to low fuel pressure and potential engine damage if not fixed quickly.
What the computer is actually seeing
The engine control module (ECM) monitors fuel pressure and flow within the fuel system and notices discrepancies that indicate leakage, often translating to a pressure drop below the expected range.
What a healthy reading looks like
Normal fuel pressure in most diesel engines is between 50-70 PSI during operation; any readings significantly lower suggest a leakage issue.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check fuel lines and connections for visible leaks or damage. Secure any loose connections.
- 22. Inspect fuel injectors for signs of leakage around the o-rings or nozzles.
- 33. Verify the fuel pressure using a fuel pressure gauge. Expected pressure: 50-70 PSI. If low, check the fuel pump.
- 44. Examine the fuel filter for cracks or damage; replace if necessary.
- 55. Clear the code and run the engine. If the code returns, suspect sensor issues or deeper fuel system problems.
Common causes
- Damaged fuel lines
- Faulty fuel injector
- Loose or damaged fuel injector o-rings
- Failed fuel pump
- Cracked fuel filter
- Sensors malfunctioning
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, it's not safe. Fuel leaks can lead to fire hazards and should be addressed immediately.
Will this code come back after clearing?
Yes, if the underlying issue isn't fixed, the code will return.
Why might this code pair with P0087?
P0087 indicates low fuel pressure, which can happen if there's a leak in the fuel system leading to insufficient fuel supply.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →