Hello,
Have a 63 truck,and just got it running and put gas in the tank and gauge does not work.The orange wire at the tank has a pulsating 12 volts at the sending unit.On the other end the gauge has a pulsating 12 volts volts on the black and green striped wire.So what should I look for to see what is right or wrong with gauge or sending unit in the tank.Thank You all for your help again.Greyhound

 

Hello,
Well I took out the gas tank sending unit and found my problem.No float on the float rod.Put a new float on and it works now.That was a simple fix for a change.Thanks

 

I like those fixes. It is great when a little effort goes a long way.

 

Often it turns out that the gauge is fine but the float has holes in it due to years of corrosion, so it won't float. Had that happen to a carburetor once, nearly had a fire due to the overflowing, eek !

 

Mine has a different problem, it reads full, even with the ground wire off of the sender.