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Re: 1994 grnd cherokee jeep
Unplug the wire from the fuel tank sender unit and earth that wire to the chassis. switch the ignition to the on position,not crank, and see if the dash gauge starts to move to the on position, if it does the problem is at the tank sender unit, assuming that the wire to the gauge is not damaged. sometimes just pulling that wire off can re-establish a decent contact when you reinstal it.also the tank sender unit should have a good earth.
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Suspect fuel pressure. You could install a fuel pressure guage. There is always a fuel pump cutoff safety switch. It is either in oil pressure switch or alternator connection. But have you changed the fuel filter?
I think you need to start with the basics as there could be numerous reasons to this. Start by checking fuel pressure,engine cylinder compession and make sure that each spark plug is sparking.You did not mention which engine is you have.
Will it try to start if you spray some carb cleaner in the throttle body? If so you need to check fuel pressure and if low, power to the fuel pump while cranking, the gauge not working could be a seperate issue. Could it be that the car is out of gas since the gauge doesn't work? Just asking. If so you may just need a sending unit. If you end up needing a fuel pump, you'll get a sender with it. I've never seen a sender and a pump go out at the exact same time, the use two different circuit's. The ECM really doesn't have any thing to do with the fuel gauge on this car.