I guess he wouldn't have 80 Ohms reading then.
In regards to the GeorgeLG questions I'd rather assume there could be something wrong with a VCM settings or a damaged input. But the damaged input check is as easy as finding if the "low fuel" indicator gets triggered. If it does, the input is ok.

 

He said he had 80 ohms If he has an open or shorted wire past that point that signal won't be what the PCM is seeing.
It would see 0 or infinity.

 

If the feedback line is shorted - it is shorted on both ends.

 

Whatever.
Not going to argue schematics. Point is if the sender is operating correctly, which it seems to be since 80 ohms is around 1/4 tank, then he needs to follow the purple and black (possibly with a white stripe) back to their sources and find what is damaged.
I'd start by re-connecting the sender and see if he gets 80 ohms across c3 13 and c3 19 at the PCM. C3 is the clear plug.
Splice pack 422 on the LH frame rail, right by the transmission crossmember is a common place for damage and corrosion.

 

Neither do I. I didn't mean to be rude, just give a pure engineering advice (short circuit are excluded). Btw. we did not mention grounded wire...