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GM vehicles ,especially trucks it seems have alot of problems with their fuel guage sending units. The sending unit is the most likely reason but it can still be wiring or the guage itself.
Does it function at anytime or is it inoperable all the time ?
Most of the time (but not always) when a sending unit is not working properly it is usually when you have a certain amount of fuel in the tank and when it gets to that level it dont function but any level above or below that level it functions.
If this is your case then I feel comfortable in saying it is the sending unit. If not you need to do further testing to be sure it isn't wiring or a guage problem.
And no this is not a indication that your fuel pump is getting ready to go out. Your best protection to keep that from happening though is regular replacement of your fuel filter.
I hope this helps.
Check the wire harness from the frame to the gas tank, the connection may be corroded or the wires damaged, That wire harness is around $15.00 at Auto Zone and hope it's not a faulty fuel sending unit. If you think it's a faulty fuel sending unit, Auto Zone can give you the step by set instructions to replacing the unit. Hint: it's easier to replace the fuel sending unit if you remove the bed to get to the top of the gas tank. Good luck and keep me posted, be glad to answer any questions you may have.
sending unit on fuel pump is bad, the sending unit shorts out gauge will go to empty or full, never read right, turn on switch ,it goes to full or empty, ,check the pump,hope this helps,thanks robert b.
more than likely it's the gauge it sets in a circuit board and sometimes the contacts get worn and with vibration it voltage spikes it and then it fails. very seldom is it the sending unit in the tank. please rate this...thanks