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Harry Ferguson Tractors Discussion Forum
Show Parts for Model:

Fuel gauge not working

Author  [Modern View]
Boss Hog

12-27-2013 03:52:49

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I have an MF 35, and my Dad has an MF 65. The fuel gauges on both of them quit working recently.
Both gauges seem to always have a random reading on on them - They're never pegged at either full or empty. But the reading is never accurate.
I have never worked on these before. Any suggestions where to start, or how to troubleshoot these things?

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Boss Hog

12-28-2013 03:58:23

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 Re: Fuel gauge not working in reply to Boss Hog, 12-27-2013 03:52:49  
Thanks for the help Steve.
I won't be at the farm for a few more days, but I'll check them both out when I get there.

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12-27-2013 15:18:16

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 Re: Fuel gauge not working in reply to Boss Hog, 12-27-2013 03:52:49  
Try this first...

Locate the fuel gauge sending unit on top of the tank. Remove the wire, and with the ignition switch on, ground the wire to any clean metal surface that you know is grounded back to the battery. The gauge should go to full. Remove the wire from ground and the gauge should go to empty. This will prove if the dash gauge is working properly.

If this test passes, remove the sending unit and look for obvious problems, like bent or binding float arm, rusty connections, etc. Usually it's best to just replace it.

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12-27-2013 21:15:57

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 Re: Fuel gauge not working in reply to Steve@Advance, 12-27-2013 15:18:16  
One more thing to look at...

Be sure the tank itself is properly grounded. Some are rubber mounted with a ground wire between the tank/sending unit and the frame.

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12-27-2013 06:24:33

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 Re: Fuel gauge not working in reply to Boss Hog, 12-27-2013 03:52:49  
If these are gas tractors then its probably another victim of ethonal.

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