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How can I fix my mower that starts but won"t run?

I have a briggs and stratton motor on my lawn mower. When I prime the motor it stars right up but will not run. I have changed the spark plug checked that the carb is getting clean fuel and cleaned the carb and air filter.I am stumped . Can you help?
Thank you
Mark81859, May 2012
Thank you very much for taking the time to answer my question. Your help is greatly appreciated.

Mark81859, May 2012
Most likely needs a new diaphragm. It acts as a fuel pump. If it's holed, or work-hardened, it will explain your symptoms.

Phil Saunders, May 2012
link Click here to see other fixes for Briggs & Stratton.