The reason I brought up "vapor lock".
I have a 1864. I messed with it off/on for a year when I finally decided the engine would stall after 45 minutes or so of mowing. I put a new Ebay plastic fuel pump on it. That made it better but it would still stall. It would run okay if I removed the left hand engine cover.
So, I removed the fuel pump from being mounted on the engine flywheel shroud to the bracket that holds the battery to get the pump away from the the heat.
Problem solved.
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