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Old 11-11-2022, 01:01 PM   #3
LockDoc
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Join Date: Aug 2006
Location: Montezuma, Iowa
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Re: K25 Fuel Gauge Problem

Quote:
Originally Posted by MrWhoopee View Post
My '68 3/4-ton 4wd came factory equipped with saddle-bag tanks in addition to the standard tank. Recently the fuel gauge had begun reading high (3 o'clock position) for the saddle-bag tanks only. The standard tank still reads correctly. I understand that this symptom indicates a ground problem, but since it affects both tanks I was hoping someone could point me to the likely location of the fault. There's a foot of snow on the ground and I don't relish rooting around trying to find it. TIA.

Are they in bed tanks or bolted to the frame underneath?

Since it is affecting only those tanks I would think it would be the ground from the engine to the frame or from the frame to the bed. The first thing I would do is to run a wire from the NEG battery terminal to the frame and see what that does. You could use a heavy wire with alligator clips on both ends or a jumper cable to test that. If no change go from the NEG battery terminal to the bed. Just make sure where you connect the wire/cable is bare metal on both ends.... That way you wouldn't have to be crawling around underneath trying to figure things out.

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