[AT] fuel sending unit

[john hall]

Doug,
 I checked to make sure the resistance was varying but failed to see if it 
quit changing at either end of the stroke. I polished the contacts and tried 
applying more pressure to the contact with no difference in reading. The 
sending unit has been replaced at some point but as far as we know the gauge 
is original. Wonder if the gauge is the problem? At least it registers 
something with quite a bit of reserve! The tank gets filled only twice a 
year, when it is time to drill. Otherwise we just keep a minimal amount of 
fuel in it. I'll pull my service manual and see if it has any resistance 
values.

John

----- Original Message ----- 
From: "Doug Tallman" <dtallman at accnorwalk.com>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Sunday, August 21, 2011 8:57 AM
Subject: Re: [AT] fuel sending unit


> John, all a fuel sending unit is just a variable resistor. Different
> mfg's use different resistance values for the gauge so you would need to
> know specs on your particular unit. The sender can be tested with an ohm
> meter. Sometimes the windings or the point that goes across them are
> dirty and I have had luck cleaning them. Sometimes the arm looses
> tension against the windings. Doug T
>
>
>
>
> john hall wrote:
>> Anybody here ever successfully repaired the fuel sending unit in a 
>> tractor? Pulled the one out of the 4020 yesterday to find the float was 
>> leaking. Drained and soldered it back up. Unfortunately the gauge doesn't 
>> quite agree with the sending units position. It takes a lot of lift to 
>> move the gauge off empty and it will not read over 3/4 full. It is a 
>> relatively simple setup and I couldn't see anything wrong so I cleaned it 
>> off and put it back in. I wonder if the problem is with the gauge or the 
>> sending unit?
>>
>> John Hall
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>>
>>
>
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