Most of the time, the fuel gauge is not the problem. The problem rests with the sending unit in the fuel tank. To fix it, you must replace the sending unit. This is done in different ways depending on the position of the tank in your particular truck.
I'm NOT 100% sure on this answer but do this and we will find out. If you are having a fuel gauge problem then CALL a Chevy parts house and ask them if they sell a FUEL LEVELING SENSOR by itself. If they do then buy it and install it on the fuel sending unit that is inside of the fuel tank and that will fix your gauge for awhile. Overtime the sulfur in the gas COATS the fuel leveling sensor and the gauge goes crazy. You may have to buy the WHOLE fuel pump sending unit just to fix your gauge. That will be A costly repair. Like I said, Don't know if they sell it by itself or not.
1 The sending unit for the fuel gauge is broken. 1 Fix, drop the the tank. Or remove the bed. On the top of the tank is 2 circle shaped caps. One has metal hoses and wires (fuel pump) and the other smaller of the 2 has just wires fuel gauge sending unit. The gas gauge sending unit is a dealer part. Some used parts shops have them but you run the risk of having to fix the issue again. 2 The gauge it's self is bad. 2 Fix, Go to walmart. Buy a cheap gas gauge. Remove the gauge cluster from the truck and run jumpers wires from the old fuel gauge to the new. Turn the key on and enjoy. Or buy a used gauge cluster and plug and play.
first thing is to work out which part is at fault? I would start with dash gauge, find wire at fuel tank which goes to gauge, earth this wire out to body while having friend watch fuel gauge, if it goes straight to full it mean dash gauge is good but sender unit in fuel tank is probably at fault. Go to car wreckers for s/h part.
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