My new fuel gauge isn't registering properly. I have a new fuel gauge and what looks to be a fairly new Fuel Sending Unit. I have done a test where I hooked the + and - and sending wire to the guage and directly wired with test leads to the sending Unit. I can move the sending Unit Float up and down it will move the needle from below empty to almost Full. So everything works. I bought the gauge from Agco but it appears to be a chinese knockoff that everyone sells. I don't know the history of the sending unit but it looks pretty new although I have owned the tractor about 5 years so predates me owning. It is not original though.
The problem is that when the sending unit is in the tank, it won't register empty at all. The needle won't move when the key is turned on and "full" registers only about 5/8 tank. I don't mind full not being full, but I would really like empty to be on the mark. When I see empty now, it seems it really has 1/4 of a tank.
I see there are two adjustments. One the entire sensor arm can slide up and down the steel channel. The other adjustment is that the float can be moved up or down the steel rod. My thought is that I should lower the float to the bottom of the steel rod and that the entire sensor should be also at the bottom. This should cause the float to work when empty but it does not.
Is there another adjustment that I need to make? The float is plastic so I think it works but maybe not? I could put it in a bucket of water and see what happens. I suppose a different float could help? There are two metal clips that can be taken off to add a different float? Anybody calibrated one of these? I don't think this is a electrical resistance issue but rather a float issue but maybe I am wrong? Any guidance is appreciated!
Here is the sending unit:
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