Gas gage read full when empty and sometimes emty

Try un hooking battery.

when the tank is full the resistance is low so the power through the gage make is read full
as the tank empties , the resistance increases so the less current means the gauge reads less until empty there is little or no power , the gauge reads empty
simple check , turn the ignition off, no power , no gauge reading

Most of the time it is a open circuit in the fuel level sensor.It located in the tank.

sounds like you need new fuel pump. fuel pump located in gas tank. before you go buy a new fuel pump first push up and down on trunk of car real hard to try to dislodge the little armature inside of tank. this little armature is what sends the signal to the gauge telling you the quantity. push up and down on truck to try to dislodge small signal armature then check your quantity. try this when you are having the problem and i am willing to bet the little armature is stuck. the only way to fix is to buy a new pump.

did you replaced just the float , because if the resistor that messures the level is not good you didn't do any thing you have to change the level sensor next to the pump..,Im sure that;s all the problem, you should also check the wiring next to the pumpand any connector down there

u need to change this gauge or try to dissasseble and clean it very well then try to install it back again

it sounds like the level sensor on the sender (fuel pick up pipe in the fuel tank) is getting stuck. the level sensor is a float that is attached to the sender, and you will need to remove the fuel tank to get to it.

hope this helps.

check your fuel pump wireing

THIS PROBLEM IS CAUSED BY A DEFECTIVE GAS GUAGE SENDING UNIT, U WILL NEED TO PULL THE FUEL TANK AND REPLACE IT.

a fuel sending unit seems to be the most popular solution. the part is about $40. I think the labor is what's going to kill you.