I have also had a ring of organic debris floating around in the fuel tank, occasionally plugging the sediment bowl inlet. It was very hard to track down.
The solution is to check the tractor quickly when it dies. Immediately pull the carburetor drain plug and see if it still has pleanty of gas. If it has gas, see if it has spark. You may have a coil or condenser getting an open circuit when it gets hot, and 20 minutes is about right. As soon as it cools down it will run again, so check it immediately after it dies.
I have never had trouble with an inline fuel filter on a gravity fed Farmall but have had several instances of plugging inside the fuel tank. I have also had condensers and coils go bad only when hot. I almost killed a hired hand one time, he was brush hogging and thought he killed a crank start A. He cranked on it until the condenser in the magneto cooled down and it would start, on a 100 degree day. He was a lot more of a man than me.
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Today's Featured Article - Tractor Generators - by Chris Pratt. As a companion to the articles on three-brush and two-brush generators, it seemed fitting that we should provide our readers with a description of how a generator works in lay terms. The difficulty with all those "theory of operation" texts is that they border on principles of electricity or physics and such. Since I know nothing of either, you will have to put up with looking at the common sense side of how generators work which means we "
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