Will not stay running

Tiny
SMAQ
  • MEMBER
  • 2000 GMC C3500
  • 7.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 151,472 MILES
I just picked up this truck and it was running before it was parked about a year ago. When I put a fresh battery in it, the security light stayed on and the truck would start and immediately shut off. Checked fuel pressure and it would struggle to get to 20 psi. I changed the fuel pump and filter and rechecked pressure. Now it goes up to 60 psi and holds at 55 psi. Same thing happens. Was thinking it had to do with the VATS, I put in a bypass and changed the module and ignition tumbler, did the relearn procedure and still, it starts and shuts off. Spray starting fluid in the throttle body and it runs on the starting fluid. So it was determined that the VATS wasn’t the issue. Any help would be greatly appreciated.
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Tuesday, November 19th, 2019 AT 10:12 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Does fuel pressure drop off when it stalls? Have you checked the fuel pump relay? I attached a pic of its location.

Here is a link explaining how one is checked:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Also, have you tried to retrieve diagnostic trouble codes by scanning the computer? Have you checked for an injector pulse?

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Let me know.

Joe
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Tuesday, November 19th, 2019 AT 8:46 PM
Tiny
SMAQ
  • MEMBER
Okay. So I finally got this truck running. I sent the main ECU out and had the security deleted. When I got it back, plugged it in and the truck fired right up. Thank you Joe, for your help in trying to get this figured out!
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Saturday, December 14th, 2019 AT 2:37 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Glad to hear you go it running. Isn't it great when the anti theft prevents the owner from driving. LOL

Take care and let us know if you have questions in the future.

Joe
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Saturday, December 14th, 2019 AT 6:30 PM

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