1993 Jeep Grand Cherokee Fuel Gauge not working

Sounds like your sending unit could be bad.

It has to be the float, may need recalabrated

The master switch is the most likely cause for the window problem,and the fuel gauge is most likely the fuel sending unit in the fuel tank

sounds like somone has a garden hose in your tank personaly i would check the fuel tank ground
it is likely the reason your gage doesnt work
once gage works you can properly monitor fuel use

Check your fuel pump ,fuel lines,.One of the most overlooked starting causes is fuel delivery. Find the fuel rail to the injectors. Assuming you don't have a fuel pressure gauge, remove the dust cap on the fitting on the fuel rail and press the center pin in the valve to see if there's a good amount of pressure for a very brief second. There will be no continuous pressure unless the engine is running or is being cranked over. Have somebody crank it for you for a second to see if high pressure is present.

If not, first look at the fuel cutoff switch usually located in the inside stowage compartment of the vehicle. See if the reset button clicks when you press it. Next check the fuel pump fuse and relay, and finally the pump itself could be bad.

Fuel level sending units are known to go bad on these.

change fuel filter sound like its stopping up .

Sounds like the fuel sending unit is bad, which is in the gas tank, along with the fuel pump.

by myself

There is a sending unit in the fuel tank that registers how much fuel there is. It is probably broken, giving you a funny reading on your gauge.