I think that your fuel level sending unit inside the fuel tank may be at fault. Because the sending unit is immersed in fuel, and the float arm is constantly moving as the fuel sloshes around inside the tank, the sending unit can eventually wear and send an erratic signal to the instrument cluster. Another type of failure can occur if the sending unit becomes coated with deposits from fuel that will also affect how accurate the sender signal is. Before replacing the sending unit I would try using a fuel injector cleaner that has the additive "Techron" in it to see if this would clean off any accumulated deposits on the sender and restore it to working order. I've had pretty good results using this approach on several vehicles in the past few years and if it doesn't help you're not out much more than the cost of the cleaner. Good luck, hope this helps!
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