The fuel level sensors can wear out and cause erratic or inaccurate fuel gauge readings.
Car Problem Reports
Dodge Intrepid Fuel Level Sensor Issues
Dodge Intrepid Problem
Visitor, 1993 Dodge Intrepid, 150,000 mi
My problem is that on my 94' intrepid, the gas gauge dropped to empty even when there was plenty of fuel. A friend of mine with a dodge truck had the same symptoms. The fuel level will spuratically fluctuate especially after putting gas in, and then after awhile it will not register whatsoever. I am still trying to diagnose this as it seems to be a factory problem.