Question about 1999 Jeep Grand Cherokee

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Recently changed the gas tank in my 1999 Jeep Grand and now the gas guage doesn't work. Is there perhaps a reset or is the sending unit gone?

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  • Jeff Turcotte
    Jeff Turcotte Aug 26, 2010

    No reset. Is this the same sensor you had in the other tank? May have damaged or unhooked during installation to new tank. Also could be the connection at the tank.

  • itgotbtr Aug 26, 2010

    The gas tank was rusting around the sending unit (round metal thing) causing a very strong gasoline odor. I replaced the tank and sending unit with a used tank from a salvage yard. The connectors on the original take were metal and the one I replaced it with had more of a plastic connector. The odor is gone but the gas gauge no longer works. I was wondering if there was a reset or something that needs to be check to make the gas guage work. It is my understanding that everything was checked. Let me know your thoughts.


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Well, I'm surprised they said it was checked out, as I don't know how they would check the sensor. My guess is the sending unit was bad on the used tank. So is the old one you had gone now? Was the tank an exact match for your old one? If not, it may be the gage has a different calibration than your old one. If you still have the old sending unit, I would reinstall that, as it was working before you switched tanks, right? And the problem you had was just the tank--or was the sending unit rusted out too?

Posted on Aug 27, 2010

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Perhaps you did not get the wires plugged back together properly. Or, perhaps you damaged the sending unit in the tank when you had it apart.

Or, perhaps you accidentally blew the fuse for it when you were changing the pump, or you have pinched some wires when you put it back together, causing a short, and the guage not to work.

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