The Ford Barn

2manycars · 07-19-2017, 07:36 AM

I just bought a 36 coupe, and the gas guage is not working. Do I need a resistor in line with the sending unit for 12 volt operation?

JSeery · 07-19-2017, 07:38 AM

No, the current path is through the gauge to the sender and then to ground. There should be a voltage drop added at the input to the gauge.

2manycars · 07-19-2017, 12:34 PM

Thanks. There is a resistor in the input line. I tested the circuit, and the sending unit is dead, or has sank to the bottom. The only floats I have are cork, and they are no good, since the alcohal in the gas melts the shelac on the cork, and they then sink. I need to find a modern float before I pull the sending unit out of the tank.

JSeery · 07-19-2017, 01:22 PM

You can get original style hollow brass floats from several suppliers I believe. An example for $12. C & G says around $5.

2manycars · 07-19-2017, 03:58 PM

I will pull the sender out of the tank and see if it still works, and if not, I see a new one is $35.

JSeery · 07-19-2017, 04:05 PM

Sponsored Links (Register now to hide all advertisements)

You can read up on previous thread/post on the pos and cons on a replacement fuel sender.

Charlie ny · 07-19-2017, 04:31 PM

2 many,
A good float from a Ford 94 carb works quite well, it will however require
soldering to the arm.
Charlie ny

petehoovie · 07-19-2017, 04:49 PM

See this thread concerning replacement of the cork float > https://fordbarn.com/forum/showthrea...l+sender+float

07-19-2017, 12:34 PM	#3
2manycars Senior Member Join Date: May 2010 Location: Eastern CT Posts: 2,732	Re: 36 gas guage on 12 volts Thanks. There is a resistor in the input line. I tested the circuit, and the sending unit is dead, or has sank to the bottom. The only floats I have are cork, and they are no good, since the alcohal in the gas melts the shelac on the cork, and they then sink. I need to find a modern float before I pull the sending unit out of the tank. __________________ Bill www.brauchauto.com

07-19-2017, 03:58 PM	#5
2manycars Senior Member Join Date: May 2010 Location: Eastern CT Posts: 2,732	Re: 36 gas guage on 12 volts I will pull the sender out of the tank and see if it still works, and if not, I see a new one is $35. __________________ Bill www.brauchauto.com

07-19-2017, 04:05 PM	#6
JSeery Member Emeritus Join Date: Nov 2012 Location: Wichita KS Posts: 16,132	Re: 36 gas guage on 12 volts Sponsored Links (Register now to hide all advertisements) You can read up on previous thread/post on the pos and cons on a replacement fuel sender.

07-19-2017, 04:31 PM	#7
Charlie ny BANNED Join Date: May 2010 Posts: 3,019	Re: 36 gas guage on 12 volts 2 many, A good float from a Ford 94 carb works quite well, it will however require soldering to the arm. Charlie ny

07-19-2017, 04:49 PM	#8
petehoovie Senior Member Join Date: May 2015 Posts: 8,130	Re: 36 gas guage on 12 volts See this thread concerning replacement of the cork float > https://fordbarn.com/forum/showthrea...l+sender+float __________________ The only thing nice about being imperfect is the joy it brings to others.... *"Silver rings, your butt! Them's washers!"* "We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969 https://www.youtube.com/watch?v=7NReUd2_0u0