How To Fix A Fuel Gauge On A Truck. A friend of mine installed a pressure gauge in his truck and watched it while driving. Just check the fuel gauge on the control panel or do it manually if you have an old generator fill the tank and give it a try.
Hopefully you can get this sorted out. However if the fuel gauge needle does its sweep as it is supposed to you need to perform further tests to properly diagnose the problem. Not sure what his pressure numbers were but he said that it would fluctuate only a couple lbs.
If it does not the issue is with the fuel gauge directly.
Now that the body is back on the chassis lay out the fuel and brake lines along with the wiring hoses and exhaust. The fuel gauge needle should go through a full sweep during the cluster self-test process. Phase four of your 1973-1987 Chevy truck restoration project comprises the more meticulous work. A friend of mine installed a pressure gauge in his truck and watched it while driving.
