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19Fordy · 12-01-2021, 08:01 PM

First, find out if the sending unit works. Remove it from the tank and place it on a piece of cardboard. Then run a wire from the gauge to the top of the sending unit and a separate wire from the metal flange on the sending unit to ground. Then turn on the ignition switch and manually move the float thru its range of motion to see if it registers on the gauge.
Check the float to make sure it has no hairline cracks. Cracks are common in old sending units.
Also read all the info. relating to gas tank sending units listed here:
https://www.fordbarn.com/forum/searc...rchid=25832191

12-01-2021, 08:01 PM	#2
19Fordy Senior Member Join Date: May 2010 Location: Coral Springs FL Posts: 10,950	Re: '49 car fuel sending unit testing First, find out if the sending unit works. Remove it from the tank and place it on a piece of cardboard. Then run a wire from the gauge to the top of the sending unit and a separate wire from the metal flange on the sending unit to ground. Then turn on the ignition switch and manually move the float thru its range of motion to see if it registers on the gauge. Check the float to make sure it has no hairline cracks. Cracks are common in old sending units. Also read all the info. relating to gas tank sending units listed here: https://www.fordbarn.com/forum/searc...rchid=25832191 Last edited by 19Fordy; 12-01-2021 at 08:14 PM.