To properly test the guage for operation you will need to remove the dash so you can remove the guage. Using a 12V source (your battery) and a set of alligator clips; connect one wire from the positive side of the battery to a terminal on the back of the guage and then another wire from the other terminal to the negative side of the battery. The gauge should read F ( no resistance). Now disconnect and the guage should read E. If not then replace the guage.
To properly test the sending unit you will need to remove the fuel tank and then the pump and sending unit. Unfortunatly the pump and sending unit are one assembly so they must be replaced altogether. You can test the resistance of the sending unit with a multimeter and actuate the lever by hand at several positions noting the resistance at each level. Call a gm dealership or a local shop and ask for the resistance range for the sending unit. I will try to find what I can for you.
It sounds more than likely that your Guage is bad.
Note: check the voltage on the back of the dash panel circuit board for a proper 12V to your guage. All the guages should be linked together so if you had a voltage problem then they would all be inaccurate. Also be aware that a bad ground caused by copper tarnish on the circuit board can occur so cleaning the contacts on the board with a suitable agent might do the trick altogether.
Sunday, June 22nd, 2008 AT 12:33 AM