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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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