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drain the tank
place a container under the vehicle and pull the hose from the fuel pump at the filter inlet and place the end in the container
turn on the ignition and let the pump fill the container
when the container is full , empty into another container with a lid
repeat the process until the gauge shows the low fuel light comes on
Now refill the tank with the correct fuel
w the amount odf contamination with what is left and the full tank will affect the engine for a few miles and then it will even out
You don't mention the year and model of your car, so generally speaking it is probably the fuel sender inside your fuel tank. This can be checked by lifting out the sender unit and testing it's resistance with a VOM meter.
sounds like the sending unit rheostat(sending unit) has a bad contact or break in the resistance wire. inside the tank theres a float attached to an arm that goes to a small rheostat, like a volume control on a stereo. the rheostat is sending a scratchy signal or no signal to the computer and your getting these readings. that part is inside the gas tank, the part usually comes integrated with the fuel pump. the gas tank has to be lowered to fix it.
I have the same problem on my 2003 Dodge Ram 2500 5.7 Hemi. Also the gauge is sometimesslow to register after filling. Maybe 5 minutes.My neighbor has the same poblem with his 1999 Durango? I think this is a job for a recall.
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