Small Engines (Lawn Mowers, etc.): snowblower, diaphram

Question
after i prime my snowblower and start it it only runs for about 5 seconds and then stops what shall i do?

Answer
you need to service carb.   it appears its not getting fuel.  if it sat around with out being started at least a few times during off seasons like most,  carb. diaphram  has dried out and will not pump fuel.  carb.  needs to be taken apart and rebuild by a service center.