Question about Chevrolet 1500

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My truck just turned 200,000 miles, the fuel gauge all of a sudden started vibrating or bouncing back and forth, it is so fast and the bounce is such a short distance its almost hard to notice. shortly after this started, maybe two weeks, my fuel pump stopped pressurizing the line so now it takes about 3 seconds to start and i dont here the pump pressurizing when i turn the key on, do you think their just might be a bad electrical connection or a seal going out and not my fuel pump itself.

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  • ZappaNut
    ZappaNut Oct 09, 2010

    My first impression is leaning toward the fuel pump.... ;
    The pressure fluctuations are evidence of fuel pressure (ie; fuel pump) issues.
    I would test fuel pressure from the fuel line sherader valve , and see if any fluctuations occure durring the test period in order to determine the next step... be it toward the wire harness ( bad choice !! cheaper to replace harness's than pay a mechanic to trace electrics...).

    At 200k miles... be hoping it's the fuel pump... and not the electrics...

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  • Chevrolet Master
  • 6,826 Answers

I think that the pump and the sending unit for the gas tank which includes the fuel level sending unit will be needed to be replaced to rectify the problem.

Of course, the wiring should be checked out as well for wear of insulation before it goes into the tank. This is a common problem for older GM cars.

Good luck on this repair.

Posted on Oct 09, 2010

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