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812 Fuel Gage

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24 May 2019 19:33 #37304 by 1748 S
Replied by 1748 S on topic 812 Fuel Gage
Have you figured out what the electrical issue was yet? Please, When you find it post it here so many others like myself may benefit from the issue and repair.


Gary Parsons

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  • Lee Carr
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25 May 2019 03:01 #37306 by Lee Carr
Replied by Lee Carr on topic 812 Fuel Gage
Yes, I figured it out but the issue was VERY hard to find. Turns out it was a bad ground inside the gage itself. It is a balanced magnet type. One magnet pulls the gage needle to full and the other pulls the gage needle to zero. The one that pulls to zero uses full 6 volt current. The one that pulls toward full uses 6 volt diminished by the resistor in the sender. The circuit for the magnet that pulls toward zero has a path to ground that relies on a copper strip hitting against the gage case. Mine did NOT so the only magnet that worked was the one toward full. I corrected it by reorienting the gage within the housing to assure that the copper strip hit the housing. Now it works!

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25 May 2019 03:58 #37309 by 1748 S
Replied by 1748 S on topic 812 Fuel Gage
Perfect explanation of a fixed problem. If my gauge has the same issue I can relate to this and know how to fix it.


Gary Parsons

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09 Jan 2020 15:51 #39209 by mflinchum
Replied by mflinchum on topic 812 Fuel Gage
That info was just what I needed for my 810! I also had the same reading for full on the gauge no matter what the fuel level was. Turns out my gauge was mis-wired but I didn't understand how it worked with the 2 opposing electro-magnets with one needing full 6v from ground and the other getting power from the sender to counter the other electro-magnet and therefore indicate the fuel level. Once I had that it wasn't too terrible to figure out which wire went to which post as well as making sure the meter was properly grounded.

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09 Jan 2020 16:19 #39211 by 1748 S
Replied by 1748 S on topic 812 Fuel Gage
i have opened my fuel sender in tank unit. I posted pictures of what it looks like before and after. Did the oil level sender too. That unit is slightly different and it was filled with horrible sludge.


Gary Parsons

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