How exactly is the instrument cluster getting the fuel level information? I had a low tank yesterday, how low I'm not sure, SID's DTE and the fuel level guage were moving all around each time I restarted my car; at one point I had the reserve light on with 60 miles left, later made a stop back at the office, started again and was apparently then out of the reserve area and back up to 90 miles, parked the car on a very angled edge of roadway, driver's side on the bottom of the slope, and when restarted the SID then read 4 miles left and the fuel guage at the bottom, reserve light on. Drove to gas station with those two sensors reading that I had nothing left, put two gallons in and SID jumped back up to 130 miles. So either the sender only reports once at startup and the fuel level then derived from monitoring the fuel consumption rate one of the injectors, or I've got a sticker sender unit. Can one gain access to the sender unit in the tank somehow?