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Fuel sending unit

  • Thread starter Thread starter JEEPRUSTY
  • Start date Start date
J

JEEPRUSTY

Guest
I am cleaning a tank and have the fuel sending unit out.
My gauge has the correct readings but the fuel readings are erratic.

I assume this is the sender and have popped open the steel housing of the unit to find that the rheostat is wound round a small rectangular piece of bakelite. The bakelite has a curve due to age I assume. It is curved to the degree that at midpoint contact is iffy to non-existent.

I could spend a lot of money or cheap out and try to fix it, though I am at a loss as to how to proceed.

Anyone here ever see this and fix it?

I am letting the gas evaporate and hope to have pics soon. They can more readily convey the situation.
 
I know exactlyn what your looking at. The board is supposed to be flat. If you look at the metal " pointer " for lack of a better word, that slides on the rehistat, youll notice a square brass nut. To calibrate the nut you will turn that nut one way or the other..litle bits at a time. What i did was to buy a gallon of water and ake a mark on the outside with a marker at the full level. Using this jug, I easured exactly 2 1/2 gallons of gas into a gas can ( my tank capacity is 5 gallons). Then once i got the sending unit back in, I out the 2 1/2 gallons in and watchd where the guage leveled out. Do this on the center stand by the way. If it was off i would drain the gas back in to the can, adjust and repaet till i ws satisfied with the reading on the guage.. and an fyi..you dont need to keep putting the cover back on the rehistat to do the calibrations..consant bendingb of the little tabs will break them of.. Do all the adjusting and then out the cover on.
 
take the cap off the tank with the unit in the tank. Turn the tank so that the float arm swings the full range of motion and listen for it hitting on the sides of the tank. My 1000c was hanging up and i ran out of gas when the guage said i had half a tank. I had to tweek the arm a bit to be sure it wasnt hitting any interior surfaces of the tank.
 
It all sounds great but will the tweaking of the arm not cause the contact surface to wear out? Not that it matters.
I would like to get the board flat.

I suppose a new unit every 25 years or so is not a bad thing.
 
Question. The sending unit out of my '79 parts bike cleaned up nicely but where the wire goes through the rubber seal (Plastic in the newer unit), it is crumbly on the edges. Do you suppose covering it with epoxy would keep it from possibly leaking?
 
I just used this guide to TS my sender. It turned out that the negative lead (the one attached to a terminal on the outside of the sender) had corroded enough that it wasn't getting a good ground. 3 minutes with a little sandpaper, and I saw the gauge move for the first time in 3 years!

Thanks for such a great resource!
 
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