CUMMINS: Fuel Delivery Pressure Low
Fuel delivery pressure is lower than expected.
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)
The engine's computer expects a certain fuel pressure to keep the engine running smoothly. If the fuel pressure drops below this level, it can't deliver enough fuel to the engine, which can lead to poor performance or stalling.
What the computer is actually seeing
The engine control module (ECM) monitors fuel pressure from a sensor. It expects the pressure to be between 40-60 psi during normal operation. If it sees values below 40 psi, it triggers SPN 4207.
What a healthy reading looks like
Normal fuel pressure should be between 40-60 psi when the engine is running under load.
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 pressure at the fuel rail using a gauge; it should be 40-60 psi.
- 22. If pressure is low, inspect the fuel filter for clogs; replace if necessary.
- 33. Check the fuel pump operation; listen for unusual noises or weak operation.
- 44. Inspect fuel lines for leaks or blockages.
- 55. Verify the fuel pressure regulator operation; replace if faulty.
- 66. Examine electrical connections at the fuel pressure sensor for corrosion or damage.
Common causes
- Clogged fuel filter
- Weak fuel pump
- Leaking fuel lines
- Faulty fuel pressure regulator
- Bad connection at fuel pressure sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's not recommended to drive long distances since low fuel pressure can lead to stalling or poor performance.
Will this code come back after repairs?
If repairs are successful and the underlying issues are fixed, the code should not come back.
Why does this code pair with?
It often pairs with fuel pump or injector-related codes, indicating potential systemic issues.
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 →