Engine cranks, does not start

Tiny
BERNIER
  • MEMBER
  • 1995 GMC SIERRA
  • 5.7L
  • V8
  • 4WD
  • MANUAL
  • 195,000 MILES
Changed fuel pump and filter. New battery, fuel pump relay. It will run on starting fluid. What am I missing?
Friday, December 10th, 2021 AT 2:36 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
If it runs on starting fluid, it is a fuel-related issue. First, confirm the fuel pump is producing the pressure needed. Here is a link that explains how to test fuel pressure:

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

I attached the pressure specifications below.

If the pressure is within spec, I need you to next check the ECM 1 fuse in the under-hood fuse box. In addition to checking the fuse, confirm there is power to and from it. Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If the fuse is good and has power, go to the fuel injectors, and check the pink wires on both to see if they have power with the key in the run position.

See pics 2 and 3 below. Pic 4 shows fuse location in the under-hood fuse box.

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

Take care,

Joe

See pics below.

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Friday, December 10th, 2021 AT 8:59 PM

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