Fuel guage - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71GMC_3/4T · 03-20-2002, 08:09 PM

Sounds like either a sunk float or something binding and not letting it come to the top.
Either that, or a sending unit that doesn't match your gauge. Contact the vendor and ask them what the resistance reading of the sender should be at full and empty. Compare that to factory spec, and also to what yours is doing. Just pull the wire and ohm from the wire to ground.
I'm betting you'll end up pulling the tank and sender and either rotating the sender 60 degrees, or bending the arm because it's dragging on the side of the tank. Just a hunch...

03-20-2002, 08:09 PM	#8
71GMC_3/4T Weapons Of Construction Join Date: Apr 2000 Location: Colorado, USA Posts: 1,095	Sounds like either a sunk float or something binding and not letting it come to the top. Either that, or a sending unit that doesn't match your gauge. Contact the vendor and ask them what the resistance reading of the sender should be at full and empty. Compare that to factory spec, and also to what yours is doing. Just pull the wire and ohm from the wire to ground. I'm betting you'll end up pulling the tank and sender and either rotating the sender 60 degrees, or bending the arm because it's dragging on the side of the tank. Just a hunch... __________________ 1971 GMC 2500, 402/TH400 4.10 Daily Driver Lafayette, CO



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