My gas gauge is always on "empty." Even after I

If you cannot fill the tank because of an erroneous reading then it is time to replace the gas gauge sending unit responsible for the anomaly. Hope fully you can do it from the trunk - otherwise you will have to drop the gas tank to gain access.

I think its time to change your sending unit in the tank,not sending a signal to the gauge

This issue is almost always the sending unit, in the fuel tank. Test that, easier said than done, as access is difficult.

Sending unit in gas tank or bad ground

I suspect either the sensor was not reconnected (or may have been damaged) when you put eveything back together or the float has sunk. Either way, you will have to do the job over to fix it.

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there is a short in the wire going from the gauge to the tank. ck the wiring under the truck from the tank going forward, and ck if anything looks like its rubbing on the wiring harness.

The gauge circuit is shunted on most cars, this is wierd, but needed to stabilize the readings... Your description sounds like normal function. Drivers would complain if the qauge were to be instant, going around corners, starting, stopping, all move fuel, and the gauge would indicate this, cauing driver alarm...Been this way for ever, although yours sounds like it is on the far side of the scale...if it reads correctly after a while, you could replace everything and you would have the same performance.

sending unit in tank needs to be replced, drop down tank and replce

ethanol fuel effects the fuel sending unit ,even just 10% ethanol.New sending units from gm adress this.

check the connections to sending unit mounted in tank if conn. ok replace sending unit