john deere 3020

Not a JD but I had a little Allis that once she got hot she would shut down but once cooled off start and run again. It was the coil.
 
Using regular gas or ethanol for fuel? Some guys having problems with vapor locking with ethanol.
 
Fill the fuel tank FULL. It doesn't take a pump to move fuel to the carb, if full. Watch out for pump failure putting fuel into the crankcase.

Also, loosen the gas cap when it quits. Do you hear a sucking sound. Vent in cap may be blocked or new cap doesn't have a vent.
 
Another thing to check is something in gas tank. I had a 706 that would run great for a while and then quit. I thought it was when it would get hot but that was just coincidence. Drove me nuts trying to
figure that one out. Finally one time when it quit it I took apart gas line, slipped a rubber hose over it and blew backwards into tank. Put it back together and it ran fine,,,,,for 15 minutes then quit
again. Blew it again and it might run for two hours. Blew it again and might run for 5 minutes. Turns out there was some kind of leaf or grass in tank. Something to check.
 

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