Geo Tracker Fuel Gauge Sending Unit. If the float is stuck or the wires are disconnected. the fuel gauge will remain at full at all times. At around 200 miles the fuel gauge needle would show 1/4 tank.
Oil Sending Unit from geometroforum.com
Your fuel sending unit is a fuel level sensor inside your gas tank that measures the amount of fuel in the tank. But the only ones i can find for the 97 and 98 trackers are really expensive. The fuel level sending unit descends as the fuel is utilized by your car or truck from everyday utilization.