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Minneapolis Moline Tractors Discussion Forum

White 2-155 fuel gauge

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08-02-2022 19:51:37

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Looking for help with a white 2-155 fuel gauge. It always reads full. Single wire to the sender, but 3 wires to the dash unit.Any way to test the sending unit and the dash gauge? Thanks!

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08-03-2022 20:21:37

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 Re: White 2-155 fuel gauge in reply to robo76, 08-02-2022 19:51:37  
Please correct me if I am wrong, it has been a while since dealing with one but 2-155 has a tank under hood and also one under cab on right side. I think both tanks have their own sending units that feed back to the gauge. Should be able to use an ohm meter and sweep senders to see if they are working.[/code]

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08-03-2022 05:41:33

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 Re: White 2-155 fuel gauge in reply to robo76, 08-02-2022 19:51:37  
Sending unit is basically a variable resistor,usually low ohms. If sending unit open or wire to it will read high to supply voltage or as full tank. As tank lowers resistance increases and gauge goes down. By manually grounding wire to sender needle will zero. If so gauge is good and sender bad.

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Alan K

08-02-2022 20:05:57

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 Re: White 2-155 fuel gauge in reply to robo76, 08-02-2022 19:51:37  
Usually when you remove the wire from the tank sending unit and ground it and the gauge goes to full the sender is at fault. If yours is reading full, there might be a bad spot in the wire that is grounding the gauge. I think most of the time if the sending unit is bad, the gauge usually reads empty.

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