Fuel guage reads on quarter full when tank is full. Im thinking sender unit but wanted to check first.
best way to test is to jack up the car support the rear with jack stands and wheel chock the tires so it doesnt roll, locate the wires to the fuel tank sender and unplug , gauge should go way past full unplugged revealing the gauge should be ok, ground the same gauge wire and the gauge should read past empty, this will test not only the gauges credibility but also the integrity of the wires and ground in the system.
If the gauge checks out good which 90% of the time they do, you must drain the fuel tank disconnect the fuel filler tube,and all fuel lines and electric connectors, unthread the fuel sender cover and remove the fuel tank sender and fuel pump assembly from the tank, seperate the two carefully in order to replace the fuel sender assembly, be careful not to bend the fuel float arm when assembling back into the tank, it is only a tiny rheostat that is controlled by the upward/downward motion of the float arm and can easily ruin the rheostat windings if the arm is forced too hard during installation.
Jun 09, 2010 |
2004 Jaguar XJR-Series