Re: Fuel guage reads 1/4 at all times even when full. How...
1.If the needle on the guage is stuck. you can try tapping the guage to see if the needle moves or turn the ignition on and off a few times to see if you can get it to move. If the guage drops to empty when you turn off the ignition you know that its not the guage. (note that the guage does not drop to zero when ignition is off with all cars of this age).
2. The problem could be with the sensor in the fuel tank itself. Rocking the vehicle up and down from the rear (you will need help doing this) may free the sensor level indicator ball in the tank.
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Check that there are no holes in the float. If the fuel is getting into the float, it will give a false reading. Another thing is to check the ground on the float sensor. If it's not connected tightly, it will create a false reading too.
Usually a sign of a faulty sending unit in the tank. If that is the problem it would need to be replaced or repaired. You could start at close to empty and then check the resistance of the sending unit with a VOM meter as you add fuel to the tank.
A loose connection on the sending unit could cause the problem but also moisture in the tank in cold weather could also be a factor in which i would add fuel line antifreeze to a full tank of fuel..........Hope this helps you out.
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.