Gas tank sending unit

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31 Jul 2016 19:03 #31436 by 1748 S
1748 S replied the topic: Re: Gas tank sending unit
Well I opened the sending unit and found plenty of corrosion but no damage. cleaned it and began reassembly. For those curious as to what is inside these Stewart warner sending units, these pics may help. If not please ask while I have this apart. The operation is really rudimentary. The arm has a float. In the electrical part that arm has a brass rub tab that not only rubs the rheostat but it grounds thru the brass rod bushing. Just follow the rub strip to the rod bushing to see what I refer to. I will caution anyone that feels they can repair a non working sending unit. They are very delicate. Had I not cleaned mine I'm positive it would not have operated. Also the old gas that I never put in the fuel tank really smells bad. I believe my car was off the road in 1949 but for sure any fuel in the tank came long before 1961 when my Dad purchased the car. He got it in pieces so it was long off the road before 1961 best I can tell by the paperwork from the last two owners before my Dad and I. Enjoy what I found.

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03 Aug 2016 13:15 #31449 by pete kelly
pete kelly replied the topic: Re: Gas tank sending unit
Check this out on ebay.
not sure if correct for us
http://www.ebay.com/itm/Cadillac-fuel-t ... hg&vxp=mtr

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03 Aug 2016 23:38 #31458 by 1748 S
1748 S replied the topic: Re: Gas tank sending unit
Thanks for the idea Pete. I might purchase one of these just to try it out. I'm a long way from needing a sender because my car wont be driveable for some time yet. Its my oil level sender that is in bad shape.

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29 Sep 2016 22:46 #31782 by 1748 S
1748 S replied the topic: Re: Gas tank sending unit
Well after attempting to repair my gas float I feel its well beyond saving. Just way too many cracks. I repaired several but still have probably 6 or 7 more to repair. Then I don't know how this heavy float will work. Plus how long will it be before another crack appears. It would be different if I could dip this float in solder but then how heavy or how long will it last.
I need to stick with "do it once and do it right".

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29 Sep 2016 23:21 #31783 by mikespeed35
mikespeed35 replied the topic: Re: Gas tank sending unit
Check out floats sold for Model A Fords. You will have to change the arm to accommodate the A float. Modern material good for modern fuels.
Cordially Mike

Mike Huffman

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30 Sep 2016 00:00 #31784 by 1748 S
1748 S replied the topic: Re: Gas tank sending unit
Thanks Mike. I was looking a just that yesterday wondering about them. Today I found a float that is part brass and part synthetic material like a plastic. My concern is finding one sized to fit into the tank opening. Mine was ruff coming out. I had to bend the rod a little so it would clear the opening. Appears to be a poor design back in 1937.

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