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Re: 1999 Malibu "Fuel Door light" is on and gas needle...
Fuel sender is bad or the plug to be sure unplug it from under the car and if you have a ohm meter the pumpside shoud be 40 ohm ety and 250 full the same wires on the bodyside should be 12 volts and ground
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weird...first thing to do is get a scanner hooked up to see what caused the check engine light-free, at pretty much any retail auto parts operation-i wouldn't get overly concerned with the gas gauge right now, teh code that tripped the check engine light might explain that problem.
i dont know the specifics of a Regal, but usually, when a needle fluctuates too much, is because the float gauge in the gas tank is worn out, or its mount became loose. You cant see that effect on a full tank because the instrument needle and the float are pegged against the stop.
You are probably looking at dropping the fuel tank down and removing the float and sending unit ( all in one unit). Once it's taken apart, you may see that you can fix it or you may have to replace it.
Replace the fuel sensor / sending unit, it is inside the gas tank, it is a lot of work to drop the gas tank, I have done it on other cars... If you want to do it make sure the tank is almost empty it is very heavy with all that gas inside make sure there is no open flames or cigarretes close
The gas guage has a sending unit in the tank attached to the pump, there is a small circuit board on it that has smal"fingers" that send the signal to the guage.These get worn off and thus sends a false reading to the gas guage in the dash. The gas tank must be removed and a new unit put in to solve the problem. I had to do this repair to mine. As for the gas issue, just try pulling the nozzle back out of the filler neck when putting gas in, sometimes the overflow tube gets plugged up and won't allow the air to escape as the gas goes in the tank, making the gas pump think the car is full, pulling the nozzle will allow the air to escape. Hope this helps.