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The fuel level sensor is in the gas tank, and if it needs to be replaced, the tank must be removed from the truck. Does your gas gauge work correctly? If not, there could be a bad connection at the tank/sensor or the sensor itself is defective.
The fuel "level" sending unit is located on the side of the fuel pump module, see red arrow on picture below. The fuel tank will need to be dropped and the fuel pump module removed in order to replace the fuel level sending unit. You can expect to pay a couple hours of labor to remove the tank and replace the level sending unit.
the fuel tank pressure sensor is located on top of the fuel pump module. The fuel tank will still need to be lowered to get at it but the fuel pump module does not need to be removed from the tank to replaced it.
This is controlled by the fuel pump/level module in the tank. The fuel tank needs to be dropped and the module replace. This is the only thing that will trigger that light is the level indicator in the tank. The module runs about $350 just so this doesn't suprise you. Let me know if you need anything else like instructions or diagrams.
The oxygen sensor has nothing to do with the fuel gauge. There are two possibilities for the gas gauge error, first it could be the in-tank gas level sensor or it could be a defective stepper motor which drives the gauge. A professional scan tool can determine the fuel level being sent by the in-tank sensor, if that disagrees with the gauge, then the stepper motor needs replacing.
to coorrect this u will need to pull the gas tank and replace the fuel gage sending unit inside the gas tank, hwerwe is the part number for the fuel module which has the seding unit in it.
ACDELCO Part # SK1158