Why does fuel guage go from half full to...

Had the same issue, ended up being the ground strap between the tank and fuel line at the tank. the strap uses spring steel connectors, easy to break.

iT WORKED FINE ALL SUMER LONG AT THE END OF THE SUMMER IT STARTED TO MISBEHAVE.
IM GOING TO GET A NEW IVR AS IVE BEEN TOLD IT MUST BE THAT, MECHANIC WENT OVER EVERYTHING AND SAID IT'S THAT SO I WAS JUST ASKING THE FOLKS HERE TO SEE IF THERE MIGHT BE SOMETHING WE MAY BE MISSING.
AS USUAL, GRATEFUL TO ALL THE MOPARITES HERE.

MAPS