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Engine shuts off and have to wait several minutes before it will start

Tiny
WAYNE FAUGHT
  • MEMBER
  • 2003 GMC SIERRA
  • 4.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
Truck runs for a bit then shuts off, maybe wait 15-20 minutes it starts back up. I replaced crank sensor and it still does it. Should I now replace cam sensor? It's not a fuel problem it gets no spark when this happens. Thanks
Monday, February 22nd, 2021 AT 8:54 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
We should check for codes, but it sounds like the fuel pump is going out. After is has stalled out when you turn the key to the on position without cranking the engine over can you hear the fuel pump run in the tank for 5 seconds? Here are a couple of guides and the fuel pump replaced instructions in the diagrams below:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

and

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

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
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Tuesday, February 23rd, 2021 AT 6:31 PM

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