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No fuel

Tiny
DOUGAN530
  • MEMBER
  • 2002 FORD F-250
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 100 MILES
No fuel, no start, checked fuse, okay, checked inertia switch, 6.5v there with key on, can't find fuel pump relay, soldered on board? Power goes through PCM relay from the diagrams I have found, only 100,000 on truck. Intermittent start/no start then it would not start at all. Fuel pump relay/PCM relay/fuel pump?
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Sunday, February 27th, 2022 AT 9:46 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,758 POSTS
Hi,

If there is one, it's behind the radio. However, I believe you are correct. It is integral.

I attached the directions below from Ford for the fuel pump relay removal. However, read the highlighted note at the top. If I recall, that is correct, but it wouldn't hurt to check.

The remaining pictures are of the entire powertrain management circuits. I highlighted everything related to the fuel pump. I'm not sure what you have done so far, but it sounds like a lot. Use schematics as a guide to see where power is lost.

Let me know if this helps or if you have other questions.

Take care,

Joe

See pics below. I had to cut the pics in half to make them readable for you. I did overlap them.
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Sunday, February 27th, 2022 AT 9:03 PM
Tiny
DOUGAN530
  • MEMBER
  • 3 POSTS
Joe, thank you so much for the diagrams and insight! I had previously looked behind the radio, no relay that I could find. But you answered my primary question, I am getting 6.5v at inertia switch so per the diagrams that tells me the (assuming integral) fuel pump relay is powered and working. I read somewhere that the power through the safety circuit is reduced so that sounds correct. So, the pump must have failed, or there's a bad connection/chewed wire perhaps, will drop tank. Thanks so much!
Shaun
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Monday, February 28th, 2022 AT 7:26 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,758 POSTS
Shaun, you are very welcome. Once you get the tank low enough, see if there is power to the pump.

Also, I don't know if you need them, but I attached the directions below for the removal and replacement of the tank.

Take care and if possible, let me know what you find.

Joe
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Monday, February 28th, 2022 AT 3:03 PM
Tiny
DOUGAN530
  • MEMBER
  • 3 POSTS
Thank you again for all the info! I hope others with same problem can find this if necessary!
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Thursday, March 3rd, 2022 AT 11:01 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,758 POSTS
You are very welcome. If possible, let me know what you find.

Take care,

Joe
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Thursday, March 3rd, 2022 AT 6:07 PM

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