Question about 1995 Chevrolet Blazer

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Ground problem? causing fuel gauge to fluctuate on 1995 S10 Blazer

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  • Druie L Dugger
    Druie L Dugger Oct 08, 2010

    We have changed the sending unit, fuel pump and wiring. With the new pump the Blazer won't fire. Put to old pump, sending unit and wiring back in the tank and it fired right up. Where is the main ground strap located on the vehicle?

  • Druie L Dugger
    Druie L Dugger Oct 08, 2010

    We added a new fuel pump, new sending unit and wiring as the vehicle also dies intermittently. With these new additions the engine wouldn't fire. Pulled them out and put the old ones back in and it fired right up. Since we have some intermittent problems we thought it might be a problem with the main ground for the wiring. Where might it be located?

  • Druie L Dugger
    Druie L Dugger Oct 08, 2010

    Thanks, we will keep working on the problem using your suggestions.

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  • Chevrolet Master
  • 6,826 Answers

If there is a ground problem causing fuel gauge to fluctuate, it may be actually a problem with the sending unit in the tank.

One should disconnect the sending unit in the tank from the harness to see if any fluctuation still occurrs which would narrow it down to wiring, or the gauge in the instrument cluster itself.


Good luck on this repair.

Posted on Oct 08, 2010

  • Duane Wong
    Duane Wong Oct 08, 2010

    I looked up 'ground strap' and 'ground' on my online resource and couldn't find a main ground strap reference regarding the fuel level gauge. However, I looked at the electrical schematics and it said that the wire is black with a white stripe for the fuel level gauge.

  • Duane Wong
    Duane Wong Oct 08, 2010

    On Ford vehicles one can look for ground straps that hook to the exhaust and the body.
    But, in general, I would say that the main ground thick wire goes from the neg. terminal of the battery to the chassis. And, the main positive wire goes to the starter from the battery.

    I'm thinking that the new parts you got were not altogether right if it would not fire up as it did with the old parts.

    I thought you had a problem only with the gas gauge.

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