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There is a fuel pump on this engine. That could be your problem. It is usually bolted on the side of the carb or very close by. It sill have a hose running to it from the intake of the engine. If the diaphragm in the pump has a hole in it the fuel will not pump into the carb.

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Q: 19 hp Briggs motor that only starts when you pour gas down the air cleaner into the carb and runs for 3 seconds and dies you have cleaned the carb?
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