Not starting, fuel pump fuse power issues

Tiny
GREASEMONKEYBARBIE
  • MEMBER
  • 2000 GMC JIMMY
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
The first couple of days that it would not start I could still hear the fuel pump turning on when I would turn the key, but I no longer hear it when trying anything. The fuel pump was replaced a year ago, although I have ran out of gas a few times in the vehicle since then. I understand that running all the way out of fuel even once can ruin a fuel pump whether or not it’s brand new. When testing the fuse control panel (located under the hood) for the IGN C fuse it is not receiving power. We tried to jump power to the fuse from one next to it and it sounded as though the fuel pump had clicked but the vehicle didn’t start. At one point of me trying to figure out this issue I took a battery to my local parts store had them fully charge it and then test the battery and everything came back as good readings on it. I put the battery into my vehicle and tried to start it hoping that was the issue but had no luck. Over the course of the next 2 weeks I attempted to start my vehicle 3 or 4 times and ended up with such a dead battery that the vehicle had to be hooked up with jumper cables just to shift it into neutral. My distributor cap does have a broken plastic ear (where you would thread the screw through) but it’s zip tied together and has been that way since I had bought it, and hadn’t caused any issues yet. I feel like my fuel pump may be bad but that there is an issue with the vehicles power getting where it needs to go and that if I can figure out where or what the issue is that the vehicle will start. Any suggestions?
Thursday, April 9th, 2020 AT 10:46 AM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Can you help me straighten this out? The IGN C fuse is for the starting system and not the fuel pump. So when you crank the engine does it turn over and not start or when you turn the key does it not do anything?

If you look at the wiring diagram, the IGN C fuse is hot at all times which means you should have voltage there all the time. If not then you have an issue from the battery to the fuse block. However, if the engine cranks then this should be okay.

If the fuel pump does not come on then we need to measure voltage going to the fuel pump and make sure it is getting power. I attached the complete wiring diagram for this and so I would just check and make sure you have voltage and if you do and the engine cranks then you need a pump.

Lastly if the engine is cranking but not starting, let's use some starter fluid in the intake and see if the engine fires. If it does then we know fuel delivery is the issue.

https://www.2carpros.com/articles/car-cranks-but-wont-start
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Thursday, April 9th, 2020 AT 11:14 AM

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