Fuel sender unit could be faulty and showing a full tank all the time. Basically the gauge is a volt meter and the float arm adjusts the voltage going to the fuel gauge when it moves up and down. If it's stuck for some reason it'll show full when it's at the top.
A local garage or auto centre can fix this easily or if you're good with spanners, it's usually located under the rear passenger seat where you can find the access to the top of the tank.
SOURCE: fuel gauge
The problem is the fuel guage sending unit, this is in the fuel tank, it will have to be changed out.
SOURCE: ford thunderbird fuel gauge stays on full
More than likely it is the sending unit inside the fuel tank. You will need to remove the fuel tank and take the sending unit out of the tank and replace it.
SOURCE: 2006 Chevy Trailblazer fuel gauge stays on empty
It requires a new fuel tank sensor that is $600 for the part.
SOURCE: 2003 Impala fuel gauge used to bounce and now
most of the time this is simply just the float in the gas tank getting stuck had the same problem in my car. unfortunately you have to access the gas tank to fix, but it is an easy fix. hope this helps any questions let me know.
Testimonial: "Confirms what I suspected. Curious as to the cost to repair."
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