Engine shut off while driving

1997 GMC SIERRA
200,000 MILES • 5.7L • V8 • 2WD • AUTOMATIC
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LUV2
  • MEMBER
  • 2 POSTS
Just put new fuel pump in. Wasn't coming on with turn of key. I straight wired to toggle switch. Worked fine for 2 weeks. Was driving truck quit running just shut off. had excellent fuel pressure when I put new pump in.. now only have 30 pds. Of fuel pressure
Jan 30, 2021 at 9:55 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Hi,

Are you sure the connections are good? Have you checked to make sure nothing is kinked?

If everything is good and there are no restrictions, it sounds like the pump is bad. I realize it's basically new, but it may have failed.

Did you replace the fuel filter and the sock at the bottom of the fuel pump when you replaced the pump?

Let me know.

Joe
Jan 31, 2021 at 7:23 AM
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LUV2
  • MEMBER
  • 2 POSTS
I've checked everything to the letter. Replaced sending unit. Sock filter. Fuel filter. Spider injectors.
Jan 31, 2021 at 7:30 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Hi,

If everything is good, then it sounds like the new pump is failing. If it has power, there are no restrictions, and everything is clear, the pump is the last thing.

Let me know if I can help.

Joe
Jan 31, 2021 at 11:07 AM
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