My first guess would be, as others have said, debree in the inlet pipe to the sediment bowl (coming out of tank, and likely above the shut off valve).
Sometimes, blockage there will be just restricted enough to not allow continuous run, but seem to have descent flow. Reasoning why you can run 20 minutes, and then die.
If tractor re-starts after 5 to 10 minutes, this is also an indicator of said problem.
Sometimes its hard to do a spark test or fuel flow test immediately after an engine die. This might happen at any given time and place, and you likely won't be able to do it in a quick nature. But if you can temporarily prevent the engine die (when it acts up) with the pulling of the choke rod, this strongly points to a fuel issue rather than a spark issue. Saves a little grief of trying to do other testing.
If your charging system don't work, and your using a battery charger to routinely charge the battery before tractor use, you can run into spark trouble if your battery charge gets low. Especially if your running a 12v battery, and a 6v coil with the in- line 12 to 6 reducer. If you got that, you could run into troubles if battery gets below a certain percent charge. Problem cured by re-charging battery to full charge. You can't run (after initial start up) until battery almost completely dead like you can with 6v everything (which I doubt you have). If 6v everything, then you can run as long as you can get any kind of glimmer out of the lights. But if you are thinking spark problem, check into this before you go replacing a bunch of un- needed things.
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