Gas tank sending unit for 6v 1937 Hudson Sedan 6

37sedanguy37sedanguy Posts: 5Member
Does anyone know what 6v sending unit might fit and work in my original 1937 Hudson Sedan 6 gas tank?


  • GeoffGeoff Posts: 4,622Senior Contributor
    You are looking for a bi-metal, not a resistor type.
    If you're stuck in a hole, stop digging.
  • Jon BJon B Posts: 7,466Administrator
    First, have you tested the circuit by running a (new) wire from the dash gauge to the sender, verifying you have power to the dash gauge, and making sure that the sending unit is grounded?  (It helps to remove the sender from the tank so you can manipulate the float arm and make sure it's moving all the way from empty to full.)

    You can do ohm tests on the sender and dash gauge to make sure they're "mated".

    What was the symptoms?  Was the needle moving at all?  If it always reads empty, the float might have sunk to the bottom of the tank.
  • 37sedanguy37sedanguy Posts: 5Member
    My gauge reads a little under 1/2 all the time.
  • ToddhToddh Posts: 359Member
    You say it shows 1/2 full/empty all the time.  Is that also when the ignition switch is off too?
  • ToddhToddh Posts: 359Member
    If it goes to ‘E’ when the ignition switch is off and will only show 1/2 then you should check to see if the float arm is stuck or you have a bad sender unit.  If the gauge stays at 1/2 regardless of the key ignition on or off, then it’s a gauge issue 
  • StepUpStepUp Posts: 69Member
    I sure wish mine always showed 1/2 Full! :D
  • Jon BJon B Posts: 7,466Administrator
    Paul Schuster (Pittsburgh, PA.) sells sending units that fit several years of Hudsons. You must modify the float arm according to the year of your Hudson.  You should get in touch with Paul to learn more.  Unfortunately, my '37 is a bit quirky and non-standard, so I engaged the services of Ken Ufheil (Plano, TX) to devise a sender that would work in my unique situation.  Contact info for both Paul and Ken can be found in the H-E-T Roster.
  • Old Fogey UKOld Fogey UK Posts: 995Expert Adviser
    On the recommendation of a HET member, I tried a Series 1 (1968-73) Volkswagen Beetle ("Bug" in the US, I think) in my 1934.
    Unfortunately, that hasn't worked.
    I think the problem is that all these modern replacement senders work on the Ohms resistance principle whereas the originals used a b-metallic strip arrangement, so unless someone reproduces something compatible with that, there's no solution.
    In the meantime, I just top up the tank to the top of the filler pipe every time I go out.
  • tigermothtigermoth Posts: 537Expert Adviser
    If you have a core. John Wolfe rebuilds them.

    regards, Tom
  • Old Fogey UKOld Fogey UK Posts: 995Expert Adviser
    Hi Tom,
    I looked at the website - is he expensive ?
    My original sender doesn't look as though there is anything to rebuild in it - just an arm that slides up and down a brass (?) strip.
    I might just try cleaning it up myself if I can open it up.
  • ToddhToddh Posts: 359Member
    Bob’s speedometer sorted out the fuel sender unit for my 34.  Now both the fuel and water level gauges work well
  • Jon BJon B Posts: 7,466Administrator
    Just for everyone's information, there are three separate forum topics going simultaneously, devoted to the subject of updating gas gauges and/or senders for Hudsons of various years:



  • tigermothtigermoth Posts: 537Expert Adviser
    edited March 14
    the price they quoted me at John Wolfe was reasonable in my opinion, but mine is a ‘35 and it is the bi-metallic type. 
     Is yours original to your ‘37?

    regards, Tom
  • Old Fogey UKOld Fogey UK Posts: 995Expert Adviser
    Can you say how much, Tom, please ?

  • tigermothtigermoth Posts: 537Expert Adviser
    I will check my records for the number. 
    Regards, Tom
  • tigermothtigermoth Posts: 537Expert Adviser
    Sorry, I could not find my paperwork, but I did call John. Nice man, but he is by his lonesome there now. He has NO help. Turn around maybe an issue and he could not give me an estimate on a King-Seeley bimetallic sender. Says he has only seen about 10 units in 50 years. 
    Regards, Tom
  • Old Fogey UKOld Fogey UK Posts: 995Expert Adviser
    Thanks anyway, Tom.
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