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08-24-2014, 08:47 AM | #1 | |
Msgt USAF Ret
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,709
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Re: 67-72 Chevy Truck fuel gauge diagnostics 101
Quote:
Next you want to run a ground wire to this terminal from any good ground. Go to the battery negative if you want to be sure. With the key on, the gauge should read dead empty. If you have a multimeter like the one shown in this thread above, you can check the sending unit. Just connect the red lead to the wire and the black lead to the tank. You won't need the key on because you're reading resistance. The reading should be somewhere between 0 and 90 ohms. zero being empty and 90 being full. If you can do this as you're adding fuel you should see the meter resistance climb from where it's at to 90 ohms. A failure to get the readings means either the sending unit is defective or the sending unit to tank ground is poor or the tank to frame ground is poor. Read through Toms excellent posts above and you'll get the visual of all this, and you'll understand how the indicator system works.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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