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I just bought a new sending unit from Max Merritt. It is too long for the tank in my 1937 138CD (should be 20 gallon tank).

The new unit is 8.25 in long and my old sending unit is about 6.5in long.

The best I can measure the tank is 36x20x6.5 which translates to 20.25 gallons.

Max Merritt has indicated that they have sold other units for 1937 120s that are the same as what they sent me with no complaints or returns. They also sent me dimensions of the sending unit they sell for 115Cs which seem to match my old unit.

So...do I have a 120 tank or a 115 tank?

What are the dimensions of the 120 and 115C tanks?

Right now, it looks like I need to get what Max Merritt sells for the 115 tank and call it good. I don't know that I need to replace my tank as it is in excellent condition.

As far as I know, the tank has never been replaced. At least not in the time since my dad bought the car in 1960. I think it's unlikely that the tank was replaced prior to that.

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Had the same issues on my 1940 120. 21gal original, 18gal replacement. I just bent my pickup tube a little bit more. Yours looks like it needs bent and cut a little off.

Is the resistance section movable on the support? If so, possibly that could slide up a bit and you can cut off the inch and a half and still adjust the rod and float for full and empty. Cut or bend the excess tube length.

The float portion is adjustable, but not enough. Only about a half inch. I could make it work if absolutely necessary. But, I would have to cut the tube and bend the tube carefully.

I’ll be better off just getting the version for the 115C which seems to match the depth of my tank.

I’m really just trying to figure out if I have the correct tank. I won’t replace it regardless since it is in great condition. Really just want to know what I have.

Chris at Max Merritt has been great to work with. I’ll talk with him tomorrow about getting the other version.

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Interesting…was the replacement from Max Merritt?

Yes from Max Merrit. Chris has been awesome to work with.