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If your fuel guage is not working check the ground wire on top of.fuel tank. Most of.the.time the sending unit in the tank is bad....not good news there. Most part stores sell the unit with a new fuel pump only. Cost you some green backs there. More bad news... the fuel tank has to droped to replace it... i my self find it is easyer to unbolt the bed of the truck and raise it up on blocks. Then you can see your wire loom and check your wires with the fuel tank in place.
No issues with the fuel guage that I know of , but you can follow the basic troubleshooting guidelines. Starting with the wiring disconnect at the fuel tank for a bad connector or bad connection. Only other connection would be up to the instrument cluster in the vehicle. Only replaceable items would be the guage or the sending unit in the fuel tank. You can disconnect the return line circuit or connector at the at the gas tank and jump a wire to the ground the that feeds the gauge and see if the guage moves, but don't and i repeat don't hold to long because the guage will go over hard over and could damage the guage. If the guage moved and I would suspect a bad float on the sending unit or a bad sending unit, either case the fuel pump assy would have to come out for repairs.
could be the guage itself, the sending unit for those guages or the wiring in between. find the sending unit, should be two wires the sending unit actually changes the amount of voltage going to the guage. cross the two wires over at the sending unit, the guage should read all the way in one direction, do this for both guages. if the guage moves to an extreme position when the wires are crossed the guage and wiring are fine and the sending unit is the culprit. if you cant get the guages to move by crosing the wires, suspect the guage itself. find you a freindly garage to help w your repair. hope this is useful
CK THE FUEL GUAGE BY GROUNDING SENDING UNIT GUAGE WIRE IF GUAGE GOES TO FULL SUSPECT BAD SENDING UNIT IN TANK ,BUT I HAVE SEEN THESE HAVE BRASS FLOATS AND THEY WILL FILL UP AND SINK TO THE BOTTOM TO INDICATE EMPTY
Check the ground wire at the wiring harness at the fuel tank. If it has a good connection then check the power wires to the tank. You may have a bad pigtail going to the tank. A replacement harness is available at NAPA.
you have to back track the wire from the sending unit to the guage. If there is no power when you put your volt meter to the wire and the body you should get movement. There could be a break in the wire, or it could be a bad guage or a sending unit. obviously the sending unit is the hardest to fix. So start with the wire, then the guage then the sending unit. If you do replace the sending unit. I personaly would replace the wire no matter what. One solid wire with a good heat and weather proof coating.
Jason, as far as the fuel gage, try a couple of resisters at the wiring for fuel gage sending unit, in gas tank. It's two wires, use the resister inline between the two wires. One resister is for low fuel level, the other for high fuel, If the gage reacts properly to both resisters, the problem is the sending unit in the gas tank. You can try 40 ohm and 250 ohm resistors. I used to get resistors from radio shack, I don't know if they went bankrupt? The store in my community closed. Other places may have resisters? Just to add, the wire colors for sending unit/sensor are purple and black with white tracer.
drop fuel tank. if guage moves all around its probably the fuel level sensor on fuel pump assembly in the fuel tank. If the guage stay's in one spot its the guage , replace instrument cluster assembly. you can take just the glass off the cluster and move the fuel guage needle and it will work (if stuck) but for how long? The wires to the guage come from the sending unit to the power train control module to the instrument cluster. pray its not in the wiring.