Not starting, injectors pulsing for a few seconds then stops?

LUKE ESTEL

MEMBER
2000 CHEVROLET 3500
7.4L
V8
2WD
AUTOMATIC
184,000 MILES

I have the vehicle listed above with a 7.4l Vortex. I have replaced the distributor and crank sensor. The truck with not start but has spark and is in time. When cranking the truck hits but will not start for 3 seconds or so then just cranks then doesn’t try to hit and just cranks. The fuel pump relay was burnt, and I replaced it and still has the same problem. Any suggestions?

Thursday, October 6th, 2022 AT 8:37 AM

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
51,541 POSTS

Will the engine run if you use starting fluid? If so, can you hear the fuel pump in the tank run when you turn the key on but not start? It sounds like you have a bad fuel pump which will cause the fuel pump relay to burn up. Here is how to replace the fuel pump, use AC Delco parts. Check out the images (below). Please let us know what happens.

Images (Click to make bigger)

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Thursday, October 6th, 2022 AT 12:12 PM

LUKE ESTEL

MEMBER
2 POSTS

The fuel pump does work like it is supposed to.

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Thursday, October 6th, 2022 AT 12:52 PM

KEN L

MASTER CERTIFIED MECHANIC
51,541 POSTS

Will the engine run on starting fluid? It sounds like you have a shorted injector which will shut down the PCM injector driver but to be sure remove the injectors wires and then check the pulse, if it returns let's test the injectors to find the one that is shorted, this guide can help:

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

Are there any codes, let's run the PCM to find out here is a guide for that as well:

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

Please go over these guides and report back.

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Friday, October 7th, 2022 AT 3:22 PM