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My GMC stopped running

Check the battery with a multimeter while trying to start the motor. A battery that shows fully charged @ 12.0 volts or more can still be a bad battery. If while trying to crack the motor and the voltage drops to 3,4 or 5 volts or something in that lower range, then your battery needs replacing...
- Wwwebchief
- Post #8
- Jul 17, 2023
- Forum: Engine Performance + Maintenance
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Fuel gauge needle vibrating

Our 1999 is the older “air core” type. We’ve added oil with a syringe to all the motors on every gauge and the fuel gauge seems to be the only one giving problems. I’ve read somewhere where if every other gauge is working fine then the fuel pump assembly with sending unit could be the problem...
- Wwwebchief
- Post #7
- Jul 9, 2023
- Forum: Engine Performance + Maintenance
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Fuel gauge needle vibrating

We’ve already lubricated the air core stepper motors and still the fuel gauge vibrates. We’re probably going to replace the fuel pump assembly in hopes this corrects the problem. He has driven in quite a few miles and the gauge doesn’t seem to be working at all. We’re beginning to think it’s the...
- Wwwebchief
- Post #6
- Jul 9, 2023
- Forum: Engine Performance + Maintenance
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Fuel gauge needle vibrating

We have a 1999 Yukon that we’ve replaced the cluster on to try eliminating a vibrating needle on the fuel gauge. That did not fix it. I’ve read it could be a ground issue, a loose fitting connection to the back of the cluster and also the fuel sending unit on the fuel pump assembly. We’ve not...
- Wwwebchief
- Thread
- Jul 9, 2023
- Replies: 6
- Forum: Engine Performance + Maintenance