The fuel pump is not working?

Tiny
ANDY CROFT
  • MEMBER
  • 1993 GMC TRUCK
  • 5.7L
  • V8
  • 4WD
  • MANUAL
  • 157,245 MILES
The truck listed above is a 1993 k1500. No pulse and no fuel pump and I swapped over to carburetor and HEI. And my 4-wheel drive is not working, and my heater is not working either.
Any help with the truck will be appreciated I'm at a loss with it, and I swapped transmission out auto for manual a transmission.
Sunday, February 25th, 2024 AT 10:00 PM

2 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,458 POSTS
We are glad to help but can you start by asking new questions about the heater and 4wd problems? We will handle the fuel pump issue in this thread. There are two fuses and an oil pressure switch that runs the fuel pump I would check the fuses in the diagrams below and if okay bypass the oil pressure switch and see if power is going through it, if so the fuel pump is bad which is common. Here is a guide to help and the fuel wiring diagrams so you can see how the system works, I also included how to change out the fuel pump as well.

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

and

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

I included the oil pressure switch location as well. Check out the images (below). Please let us know what happens.
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Monday, February 26th, 2024 AT 11:38 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Anything?
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Saturday, May 11th, 2024 AT 11:38 AM

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