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How can I fix my briggs and stratton 35 classic?

Engine starts and runs well on primed fuel, then runs poorly when primed fuel runs out , does then not appear to be getting correct fuel mix. Air filter and jets cleaned plus new gasket and daphram to carb.bryan
bryan, April 2010
hi did you put the gasket on right it appears it is still drawing air from a leek

nelius, May 2010
Remove petrol tank cap and see how it runs. Possibly blocked cap vent or could be a blockage between tank & carb.

Chris P.Duck, April 2010