I'm inclined to agree with Steven and Leroy about ruptured pump diaphragm. If it was a gravity feed with leaking needle it would flood much worse and be difficult (maybe impossible) to start but once running there's no reason to die. On the other hand pump diaphragm leak's less when not running and isn't sevearly flooded when started. Once engine is running air pulses from crankcase tube leak through diaphragm and blow's fuel back instead of pulling fuel as it's supposed to. IMO,OE carb is far better than aftermarkets. Genuine Briggs replacements are very expensive so I rebuild OE with Briggs labeled kits if and when rebuild become's necessary. Before rebuilding gravity feed,I first "lap needle in seat"with valve paste or auto paint polishing compound and that usually fixes it. On diaphragm pumps,I block the pulse tube then install a 12v in-line pump. This issue has caused failures in what is otherwise near builtproof engines. It contributs to both, bent push rods and short engine life. That B&S hasn't made a simple change is hard to believe. Truly one of those situations where "a stitch in time save's nine"when buying machines with B&S engines.
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