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how to test a fuel guage
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tractorman View Drop Down
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Joined: 22 Sep 2009
Location: west central wi
Points: 1046 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tractorman Quote  Post ReplyReply Direct Link To This Post Topic: how to test a fuel guage
    Posted: 09 Mar 2012 at 5:15pm
I have non working fuel guages on my 185, 190 and Simpicity Sun Star  How do i test them so i can get them fixed???  TractormanCry
Play on 38 B 49 WF , working on D14, D15 B10, Bee 12 B110. use 185 and 190
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Austin(WI) View Drop Down
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Joined: 11 Sep 2009
Location: Wisconsin
Points: 1460 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Austin(WI) Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2012 at 5:21pm
First find out if it is the gauge... Ground the gauge and see if it moves...if not the gauge is junk and you need a sending unit.
"Better By Design"
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Gerald J. View Drop Down
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Joined: 12 Sep 2009
Location: Hamilton Co, IA
Points: 5636 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Gerald J. Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2012 at 7:45pm
I take the sending unit out of the tank. I connect it to the gauge normally and I use a clip lead to ground the mounting flange of the sending unit. Then I run the float up and down by hand to see if the gauge follows. On one of my tractors the wiper on the resistance wire was worn (along with the pivots) so it wasn't touching. I was able to bend the contact to make it ride on the resistance wire coil again and now it works.

There are two schemes for a gas gauge, either the resistance rises as the fuel rises or the resistance goes down as the fuel rises. Testing by shorting the sensor terminal to ground gets different results on the gauges with these different systems. In one it pegs the gauge at full, with the other it drives it to the peg at empty. Then with the opposite operation there are several values that have been used for full and empty resistances so gauge and sender have to match to have a useful gauge display.

Gerald J.
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