Why does the low fuel light come on even with plenty of fuel 1994 intrepid es?

If the fuel gauge isn't working properly, then the problem is probably related to the fuel sending unit in the trunk. To check it, do the following: 1.Remove the trunk carpet. 2.Put some Ohmeter probes on the sending units elctrical terminals and check for resistance. 3.The first check should be done when you know the tank is full and the resistance should be about 6 ohms. 4.When the tank is almost empty check it again. Resistance should be about 1,035 ohms. 5.If the readings aren't correct, or if there's hardly a change in them, replace the sending unit. Just so you know, you can check the unit by removing it from the car and moving the float assembly manually and using the method above.