The Stovebolt Site Forums The Shop Area The Electrical Bay Fuel Gauge wiring

Maybe this diagram will clear it up. The jumper is only a test. If the gauge goes to empty while performing this test, the gauge and sending wire are good and it’s the sending unit or the ground thats the problem. The jumper goes from the terminal on the sending unit to a “known” good ground, essentially bypassing the sending unit. Don’t assume a ground is good. Go back to the battery if you have to as it’s essential to have a good ground. Next remove the jumper from the terminal that goes to the gauge, keeping the jumper on the ground and touch it to the body of the sending unit. This test will bypass the ground wire checking whether you have a good ground to the sending unit. If the sending unit is good, it should show the actual level of the tank. If it acts like it did originally, it’s time to remove the sending unit. Let us know your results and we’ll tell you where to go from there.