Dave-Have been admiring your work, and would like to help. I don't have a 10-20, but the carb would seem to be similar to our 1927 Farmall Regular, or 1925 15-30. If fuel is dripping through the copper tube, then I believe that your float is not stopping the flow of fuel. I think the copper pipe is more or less of a vent pipe, for the fuel bowl. Your float is probably cork. If it is not new, I would consider getting a new one. Old ones can get soggy, and too heavy. I have let them dry out, for a long time, and coated them with shellack, and have had that work. Also, if you can see fuel running through that copper vent tube, then you probably have the tube to the air cleaner removed. Our 15-30 won't run with that tube removed. Must need the resistance of the air cleaner to draw the fuel through the carb. Sometimes a float will hang up, and you need to tap on the bowl, to free it up, and keep the carb from running over. Hope some of this helps. Lots of guys on this forum know more about these, than I do. Hope to see your tractors at the Cedar Valley Engine Club show.
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