Will not run, possible fuel pump issue

Tiny
BERNARD MOONEY
  • MEMBER
  • 1996 GMC SONOMA
  • 2.2L
  • 4 CYL
  • 2WD
  • MANUAL
  • 179,000 MILES
Truck quit running replaced fuel pump checked relay relay is good. Checked grounds. Still will not run. Checked power to fuel pump gray wire no power cannot figure out what the problem is. Any ideas?
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Monday, July 9th, 2018 AT 10:48 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi and thanks for using 2CarPros.com.

I have been looking through wiring schematics and have determined it can only be a few things. First, make sure the fuel pump ground is good. Next, look at picture 1 and 2. They are from the same page, but I had to copy it twice for it to fit and be readable. These pictures show the fuel pump relay, oil pressure switch, and fuel pump. Power is supplied via the orange wire which runs to both components and then to the pump. If the relay is good, suspect the oil pressure switch not allowing power to the gray wire. If the oil pressure switch is good, suspect the relay is bad. Next, confirm there is power from the orange wire going to these components. Power is supplied via the PCM pin 3 (see picture 3). Confirm power is present and there is no break in the orange wire.

The last picture I attached is of the entire page, the one I cut in half for pictures 1 and 2. I don't know if you will be able to enlarge it.

Here are a couple links you may find helpful when looking for electrical problems:

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

I hope this helps. Feel free to let me know if you have other questions.

Take care,
Joe
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Tuesday, July 10th, 2018 AT 7:08 PM
Tiny
BERNARD MOONEY
  • MEMBER
Thanks.
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Tuesday, July 10th, 2018 AT 7:13 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Glad to help. Let me know what you find.

Take care,
Joe
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Tuesday, July 10th, 2018 AT 8:48 PM

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