Quote:
Originally Posted by Wincks2
Took the sending unit out of the tank and it is a diesel sending unit from the year 82-83, the only year they made them with a third wire for a water in fuel light. The third Tube went down to t he bottom of the tank. The top was connected to a tube that tan along the frame toward the rear of the truck and connected to a petcock to allow draining water from the tank.
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Interesting. I assumed the WIF light was on the fuel filter housing like my 2000. I don't have GM wiring manuals past 1980 with the exception of the 1989 R/V wiring manual.
Are the drain valves still inside the spring hangers? I might be tempted to hook em back up if they are.