Fuel Gauge
I have had similar issues, once with my '96 Caravan and again with my (now sold) '88 BMW 750 and both times it was a faulty fuel sending unit. The good news, replacing them solved the problem, the bad news they are part of the fuel pump module and located in the tank. With my Caravan I replaced the fuel pump (at 75,000 miles), it was more costly than replacing the sending unit, but at that mileage I just bit the bullet and put in a new pump. If you have ramps and are handy with tools you can do the job, it requires that you lower the fuel tank about 6 inches, but I did it (I am cheap) half sitting up under the car, and on my garage floor
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