Will not start after replacing fuel pump

Tiny
LAUREN RUDDOCK
  • MEMBER
  • 1987 GMC JIMMY
  • 4WD
  • AUTOMATIC
  • 168,000 MILES
Just replaced the fuel pump and it won't start.
Tuesday, July 6th, 2021 AT 2:22 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
Hi,

Will it start for a couple of seconds and then stall if you use starting fluid? If it does, then we know fuel is still the issue. If it doesn't, then suspect ignition (no spark to plugs).

Here are three links you may find helpful. The first discusses a crank no start condition, the second is how to test fuel pressure, and the last is how to test for ignition spark.

https://www.2carpros.com/articles/car-cranks-but-wont-start

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

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Also, you could check for diagnostic trouble codes that may help. The vehicle has an OBD1 system. All you need to retrieve codes is a short jumper wire or even a paper clip. Follow the directions in this link:

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Let me know what you find or if you have other questions.

Take care,

Joe
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Tuesday, July 6th, 2021 AT 8:13 PM
Tiny
LAUREN RUDDOCK
  • MEMBER
  • 2 POSTS
No it doesn't start at all. It turns over and tries to start but nothing even when we pump the gas pedal a little bit.
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Wednesday, July 7th, 2021 AT 10:00 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
Hi,

It should start, at least for a couple of seconds using starting fluid. Have you tried that technique? Have you checked fuel pressure to make sure it is getting fuel?

If you did try starting fluid and it didn't make a difference, have you checked for spark to the plugs?

Is it possible for you to record the engine cranking and upload it for me to hear? That may help me.

Let me know.

Joe
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Wednesday, July 7th, 2021 AT 7:53 PM
Tiny
LAUREN RUDDOCK
  • MEMBER
  • 2 POSTS
Thank you for your help. The guy decided to still buy it like it is. He wants to rebuild it from the frame up.
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Thursday, July 8th, 2021 AT 9:16 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
Hi,

You are very welcome. I wish we could have determined what was happening. Regardless, I'm glad to hear you sold it.

Please feel free to come back in the future if you have questions or need help. You're always welcome here.

Take care,

Joe
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Thursday, July 8th, 2021 AT 7:31 PM

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