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Fuel pump not working

Tiny
HEIDE1234
  • MEMBER
  • 2002 FORD EXPEDITION
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 180,000 MILES
Started cutting out and would shut off, would not start back up. Let it sit for couple hours started and ran for a week then cut out again in town. Now will not start and fuel pump is not working. Checked fuses and swapped relays around. What should I try next? I do not feel it is the pump itself.
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Monday, July 2nd, 2018 AT 11:35 AM

2 Replies

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I am Danny.

I have dealt with many in-tank fuel pump problems and this sounds like one. I would suggest performing a fuel system pressure test. Many auto part stores have tool loaner programs(AutoZone,Pep Boys, O'Reilly's) to rent you a tester. With the key on engine running pressure should be 28-45 PSI and key on engine off should be 35-45 PSI. You can find a Schrader valve on the fuel rail to attach the pressure tester. I am attaching a tutorial on how to test the fuel pressure and how to test the fuel pump relay. Hope this helps and feel free to ask any questions. Danny-

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

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Monday, July 2nd, 2018 AT 5:47 PM
Tiny
BMDOUBLE
  • MECHANIC
  • 1,139 POSTS
Symptoms match perfectly with a failing fuel pump. It’s right at the mileage when they fail, see them all the time at my dealership. But by all means do your tests.
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Tuesday, July 3rd, 2018 AT 7:58 AM

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