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if the engine only runs when gas is poured into the carb it is generally caused by plugged jets and/or stuck needle in the seat. if it has been sitting for a length of time the fuel has either crystalized causing the plugging or the ethanol has caused a problem. if it is a new unit, briggs recommends tapping the carb lightly with a hammer to loosen the needle in its seat. for one reason or another the engine is not getting fuel through the carb

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Q: Why will the engine only run when you pour gas in the carburetor of the Briggs and stratton engine?
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