Take the 2-minute tour ×
Motor Vehicle Maintenance & Repair Stack Exchange is a question and answer site for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles. It's 100% free, no registration required.

My OBD shows that I have low fuel pressure in a 1997 Ford Mercury (tracer). Do I have to replace the fuel pump? If so, do I have to replace the whole thing or is it enough to replace just the motor unit? What else might cause low fuel pressure reading?

share|improve this question
1  
I am not familiar with a code or a data output that measures fuel pressure on the OBD system. If it's a code what's the code, if not is it a data point that simply says low fuel pressure, or does it give a valve? Also please include the engine size in your question. –  Larry Jul 31 '11 at 19:29

1 Answer 1

Generally speaking (not familiar with that model), it could be due to:

  • Bad fuel pump (fairly rare, fuel pumps are one thing that usually last forever)
  • Clogged fuel filter (has it been changed recently/ever?)
  • Bad fuel pressure regulator (although, they usually fail the opposite way)
  • Leaking fuel injectors (unlikely, would require a pump that's marginal to begin with)
share|improve this answer
1  
I'd change the fuel filter first, that one is often overlooked... –  Timo Geusch Aug 2 '11 at 19:29

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.