I fought that flood over problem for years on my 4020 JD gass model. The fuel lines are a bit rusty internally and the carb has a steel needle/ brass seat. The slightst bit of dirt or rust will hold the needle off it's seat and flood the entire engine.
It's a real pain to turn the tank valve on / off every time I use the tractor.
I finally installed a 12V solenoid valve inline before the carb that opens/ closes with the ignition. That totally ended the problem, even if the needle valve leaks, the fuel supply is automatically cut off when I turn off the ignition.
The valve was avalible from my local propane supplier, as the valve is a gasoline fuel lock for a dual fuel propane / gasoline fuel system.
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Today's Featured Article - A Tractor's Point of View - by John Manley. I began my life on August 3,1941. I was actually built at different times and days but I was officially an M Farmall on August 3.I was real nice and shiny. That�s me, in the old picture, third from the left. I was loaded on that train and sent to a little town in South Carolina. I didn�t get to see much of that town. I was moved off the train fast and on to the dealer�s
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