Might need a new fuel level sending unit...... or the gauge cluster is bad... there was a recall years back on the gauges.... the sending unit is not terribly expensive but the gauge cluster...good luck
Yes they are known for gauge cluster problems. But also known for bad ground connection Follow the black wire from fuel pump
Hi, this is a pretty common problem on these Silverado instrument clusters. We can repair it for you or provide you with the parts to do it yourself. Click here to learn more about these Silverado instrument cluster problems: Dr Speedometer Instrument Cluster Repair Speedometer Repair Guage...
I think this is a very common problem with these trucks the same thing has happened to me and i replaced the fuel pump and sending unit and the gauge worked great for about 2 days then it went back to bouncing all over the place. And it seems to be one of the most asked questions in the GM forums.
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