Won't start after running it for a while.
Question edited. *won't not 'want'. Not sure how American people get mixed up with these two completely different words. Won't is 'not happening', a contraction of 'will not' and an answer is what you 'want'.
However we can't answer because you question is missing vital information. If it is a vehicle, car motorcycle, jet ski, scooter, we need 'year make model'.
If it is a generator, lawn tractor or weed eater we need 'make model (what it is)'.
You can always Google
Year make model won't start when hot
or
make model won't start when hot
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