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1999 Silverado erratic fuel gauge

I have a 1999 Silverado with an erratic fuel gauge problem. I pulled the sender, and it does not appear to be the problem. The gauge goes up and down without warning and is almost never correct. I have been using the odometer to keep track of fuel used.
I switched out the instrument cluster (a friend had an extra), this did nothing so I pulled the bed to access the tank.
I removed the fuel pump and can access the float now. The gauge moves a lot when I move the float from upper most to lower most positions. I still never was able to make it read both extremes?
I can jump across the two wires in the connector and make the gauge move all the way to full. When I remove the jumper, the gauge stays on full for 20 seconds, then it starts jumping around again? This makes me believe the sending unit is probably ok.
Help if you can.
pawn999_99@yahoo.com

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  • Chevrolet Master
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The current to the sender can't be allowed to be DC because it could spark and blow up.
So they use a ******** or oscillator to turn it into AC. That could be the problem. It is usually mounted near the gauge.

Posted on Jul 27, 2009

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  • Master
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Ive had the same problem on my vehicle change the flow assembly the sender could look good but have open wires throw the coil good luck

Posted on Jul 27, 2009

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Publication Date: January 22, 2008
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Eligible Under Provisions Of New Vehicle Limited Warranty Coverage And Emissions Warranty Coverage
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