Small Engines (Lawn Mowers, etc.): TECUSEEH 6.75 CRAFTMAN, gas flows, oil level

Question
GAS FLOWS OUT THE CARB AFTER ENGINE IS SHUT DOWN, FILLS UP THE AIRFILTER WITH GAS.AND HARD TO START AFTER IT HAS BEEN RUNNING.SOMETIMES IT SEEM LIKE IT LOCKS UP MEANING HARD TO PULL.LAWNMOWER.IS ABOUT 4YRS OLD I CHANGE THE CARB DIDNT WORK SAMETHING I CHANGED THE PLUG AND AIR FILTER .

Answer
Hi Richard,

Fuel flowing from the carb, indicates a stuck or heavy and fuel logged carb float. Did you change the carb with a new one?   
Locking up may indicate an overfull oil level which may contain fuel from the overflowing carb, or a timing issue.

Let me know what you find.
Michael