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it is losing its prime... i have the same problem right now and i have cleaned the carburetor, changed the gas and spark plug and changed the air filter. The only thing that i can think of is that there is something wrong with the priming bulb or the gas cap is hindering the air flow... still trying to repair....

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Q: Why does a Briggs and Stratton 4.5 HP lawn mower engine stop 2 3 seconds after it starts unless you continue to prime it?
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