Question about 1999 GMC Sonoma
What your going to have to do is first locate a wirin diagram on your vehicle. You need to look at the schematics and find out exactly what is controlled on that circuit. Once you know what is all on that circuit you can than start to check your wires around those connections. I had a similar problem with my s10. My truck is a 1993 but it has the ecm b fuse as well. I was driving my truck with no problems. I parked it and a few days later came out to find that it would not start. I checked and found that I was not getting fuel and that my ecm b fuse was blown. I did my home work and looked at a wiring diagram and found all the circuits on that fuse. After some time spent under the hood, I found that over time I had 2 wires that had been rubbing on the base of the oil pressure sender and had been grounding themselves out on the block causing my blown fuse. The oil pressure sender controls the fuel supply and if the truck did not read any oil pressure, the computer shuts down the oil pump, to prevent any damage that could be caused by not having any oil pumping. I hope that I may have helped you in finding your problem.
Posted on May 12, 2009
It's not the fuel pump, you have a short to ground somewhere in that circuit.
Posted on Feb 20, 2009
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