I have an '89 Jeep Cherokee Limited and when the gas gauge reads less than 1/4 tank a fairly loud drone like humming comes from the back of the car and goes away when I fill it with gas??? It doesn't make any sense!!!

 

I have that noise too in my 91 right now. It sounds like a zombie is getting its brain picked out in my gas tank it's annoying. My gas gauge is reading 1/4 tank when full too. Just waiting on the new carter pump assembly to deal with all that.

 

On one of mine the metal return line is rubbing on metal in there. Also often it sticks on 1/4 tank, maybe because with the assembly not in there right, the float it hitting something.

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.

 

bag might be a better description of the noise than my description. But it's spot on!😂 however my tank gauge doesn't stick. It just "zombie moans" when it's just under a quarter tank. So weird

 

does it effect fuel economy if I leave it and not fix it?