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Sounds like the float is stuck on the sensor in the tank.You could try takeing a rubber mallet when the tank is near empty and rap on the under side or any where you have access.If this doesn't work you may have to drop the tank and replace the level sensor.Well good luck and hope this helps.
Bad fuel level sensor. Unfortunately it is located inside the gas tank. Fairly common problem on GM's. Due to sulphur in fuel. Corrodes the sensor tabs. Expensive to have repalced and NOT a do-it-yourself project, unless you have dropped a tank before.
The gas guage is a seprate problem, the gas fill hose may have a sharp ben in the hose or kink, the gas pump hase a shut off valve that shuts off the pump if gas does not flow freely ie:blockage or full tank, I would visualy inspect the filler hose from the gas cap to the tank for again sharp bends or kinks, if the filler hose is in anyway restricked the pump may asume the tank is full.
the gas guage: is usualy a simple flot on a rod in the tank (like a toilet tank has) instead of opening or closing a valve it operates a "potentiometer" veriable position sensor (kind of like a dimmer switch).
if the float gets stuck the guage will stay in that position, the guage gets the signal via the wire harnes, so check the electric circit.
A trick I used on one of my jeeps (I removed the guages ) I filled the tank, reset the trip odometer to zero, put a jeerycan and a couple gallons of gas in the jeep, then drove normaly a week or so till I ran out of gas. wrote down the mileage on the trip odometer. gerrycan gas got me to the gas station.
divided the mileage by half. I fill up the tank all the way the reset the trip odometer to zero, when I reach the half mileage of the tank I fill up again and repeat
But it works ok otherwise? Be happy, it's working then. No offense, but alot of vechiles when you fill it up full, and I mean FULL will read over full, and will stay there untill tank isn't overfilled. Since your drivnig a good fuel economy car, it will take several days.
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