Rufnek16

Recently I replaced the fuel sending unit in my 89 XJ. I had a bad fuel level sending unit. Since replacing its topped off my tank and the fuel gauge never went above half and now it is dropping down to empty even though I haven't been driving it.

RTorrez1

I would start by rechecking the ground for the pump.

Fred/N0AZZ

^ What he said^

DFlintstone

I removed my assembly, checked that it worked, re-installed, had problems, repeat, still works funky. Later I found this info on exactly what holds the deal in place, a black rubber cone that I'd never seen. Mine is probably loose in the tank somewhere.

Btw I put this in the info in my signature>>>


Below is the inside of the tank. The black ring you see is the end of the cone that belongs on the end of the fuel return line on the pump assembly. That cone on the metal line holds the bottom of the whole deal in place. That should be fished out, and installed on the metal fuel return line on the assembly. Then you seat the cone into the receptacle in the tank when installing it. The fuel return and pickup are located in a tray inside the tank, so return fuel is available to be picked up at the pump inlet, even when the tank is low or at an angle.