I have a 93 gmc sierra k/1500 5.7 litler. The gas gague does move, but its stays on half a tank, moves going up and down hill, never sure how much gas is in it. when its emptie onlt moves when ran out of gas and stick at 1/8th of a tank. when i tried to put gas in it, the gague moved minimally but truck wouldn't take the gas, im sure its the sending unit but not sure how to start working on it, im a newbie in the machanics relm. HELP?
Videos on youtube showing how to test .
Diagnosis of Stuck Fuel Gauge Is it Gauge or Sending Unit
The fuel level gage sending unit is defective, very common problem. The sending unit comes with a new fuel pump and is referred to as a module, also make darn sure you replace the fuel pump connector at the fuel tank, solder and shrink tube the new connector on, DO NOT USE CRIMP CONNECTORS.
SOURCE: i need help resetting my 94 GMC seirra's gas gage
the gas gauge is on the fuel pump assembly with in the fuel tank, you must have bumped it during reassembly. the only solution is removal. pull it out check for alignment and binding, reassemble being very careful. hope this helps.
SOURCE: 1988 gmc sierra temp gauge
you could have an air lock in the system. Run with rad cap off and cycle the thermostat, adding coolant as required. Or a possible heater core.
SOURCE: 1987 GMC sierra , no fuel pump power.
The inline fuel pump fuse on the passenger side firewall is good? Are you jumping it with 12 volts at the test lead or the fuse?
SOURCE: My Power window on my 2003 GMC Sierra 1500 Truck
if your main switch panel still works the passenger window and if door locks still work probaly bad window motor
SOURCE: 2005 GMC Sierra 1500 - heater blows, but only cold air
Check coolant level. Check for heat at the heater hose going from water pump to heater core at firewall. Check to see that cable is moving coolant control valve from the closed to open position. Low mileage so it shouldn't be plugged heater core.
Testimonial: "You were absolutely correct. Low coolant level. Put in some 50/50 and we're nice and toasty now, but need to find out why coolant was so low. Thanks."
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