There are some very cheap aftermarket senders out there. We have seen plastic floats that melt in fuel and we have seen the electrical terminal leak fuel. So first you need to know if your sender is in fact faulty or does it have a saturated float or is the fuel gauge the fault. If you do determine you need a new sender, Here's what I suggest....
Buy a decent sender at 45 to 60 usd. Per the odds, expect it to report wrong. From there you have 2 options,,, purchase and install Inteletronics metermatch module to program the sender gauge relationship or send your OEM sender out to be restored.
On a side note, I don't know if the metermatch module retains its calibration points if/when the battery is disconnected.
Restored OEM sender is with out a doubt the best option but the turn around time might be 6 weeks. A aftermarket sender will be a quick fix providing some clue of how much fuel you have.