I was given an older entry level (I think) Sears walk-behind mower with a very common Briggs & Stratton 4.5 hp motor. The kind with the carb on top the gas tank as an integral part of the gas tank. It has the primer-bulb carb. I am a LawnBoy man, not Briggs, so I am not too familiar with these 4 cycle carbs. Between the carb body and the fuel tank is a thin rubber membrane AND a gasket. I have reason to believe this mower was worked on before and possibly not reassembled correctly, as I found the mower blade installed upside down. What I need to know is this: Does the rubber membrane go directly against the underside of the carb body, then the gasket between that and the tank? Or is it gasket, membrane, tank?
Craftsman push mower, Briggs & Stratton carb question
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tigercat
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The diaphragm is your "fuel pump". The older Briggs engines are great engines. Lawnboy makes great 2 cycle engines too. My brother has a couple lawnboys from the 70's. He just retired one of them. The deck cracked so he moved the engine over to the other.....