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Old 08-03-2018, 10:46 AM   #29
hatzie
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Join Date: Oct 2008
Location: Wentworth, NH
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Re: 1973-1991 Dual fuel tank systems theory of operation

Quote:
Originally Posted by 808_67C10 View Post
HA! So, I started the truck this morning and the gas gauge read right on full.... then, after driving about 2-3 miles, she topped out about 1/4" past Full - I swear, these square bodies and their electrical issues. I miss my 67 c10 so bad right now! LOL
3:00 on the gauge is usually your ground from the sender ring to the frame... It can be a damaged wire or dodgy connection between the sender and the gauge but usually it's the short little ground wire.

Try grounding the fuel tank to the frame with some jumper cables. If that fixes it the ground wire is your 3:00 needle problem...
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RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.
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