My guess is now a sticking float valve in the carb, but then I realized we would all be doing a lot less guesswork here if a $20 fuel pressure gauge were installed between the pump and the carb. Could have ruled out the need for the new pump.
Even if you find a competent mechanic to finish this off (which I don’t think you need to do) you’ll save a lot more than $20 of his troubleshooting time with that in place.
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