gas gauge testing - Corvette Forum
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post #1 of 2 (permalink) Old 05-05-2020, 03:58 PM Thread Starter
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gas gauge testing

Took my 78 SA out of mothballs after 1 year storage. Everything came up well except the gas gauge. The needle pegs past the F mark. I don't know whether the gauge is bad or the sending unit that I assume is in the gas tank. How do I test the system to see where the problem is?
Thanks for your help.
Bruce McCullough is offline  
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post #2 of 2 (permalink) Old 08-20-2020, 01:29 AM
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Suggestion is to first check the wires to the sender aka Fuel Meter Assembly located under the fuel door. The rubber boot aka seal needs to either be removed or gently pried up on the right side to view the ground wire, and closer to the neck on the right side, the sensor wire. If prying up the boot is too hard, because of boot age, remove the door assembly taking out four screws. Then remove the boot carefully to avoid ripping the drain fitting and check the wire connections. The ground may need cleaning with a pencil eraser to provide better contact. Remove the sensor wire and turn on the ignition and see what the gauge shows. If it moves to empty, the gauge is working and the sender s bad, may need cleaning or replacement. If that doesn't solve the problem and the gauge is still pegged, suspect a bad gauge or an electrical short. Check the door assembly for worn out bumpers, two for closing and one for opening. I had to get a storage compartment bumper (larger size) for opening since the door was opening too far and hitting the edge of the fiberglass opening. Good luck.
PHD - 78 Anniversary is offline  
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