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Old 06-11-2003, 11:54 AM   #2
71GMC_3/4T
Weapons Of Construction
 
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Join Date: Apr 2000
Location: Colorado, USA
Posts: 1,095
You should have a brown wire running from the fuse block terminal to the sending unit on the tank. The tank should be grounded due to the way it is mounted.
If you ground the brown wire, your guage should move to empty. If it is open, the guage should go past full.
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1971 GMC 2500, 402/TH400 4.10 Daily Driver
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