I have a Tecumseh engine 17.5hp on a Murry Lawnmower. 2 years ago it started serging, I cleaned the carb and that fixed it for a year, then last year it got so it wouldn't start unless I primed it. Today I put on a new carb but have the same problem. I have to pour gas in the air cleaner and choke it and get it started. Once started it runs ok and will start normally as long as its hot, but as soon as it cools I have to prime it again. Does anyone know what I should check now?
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