Small Engines (Lawn Mowers, etc.): Briggs carb, carbuerator, prime issue

Question

briggs carb David,,hope you can help. This is a Briggs engine 10A902.I replaced the gasket and the diaphragm and pulled the jet out and cleaned the whole carb. Starts on one or two pulls and runs great. My problem is when I press the red primer plunger it will not squirt gas out of the little nossel. Know when I stick my finger down the throat and cover a little bit of the small nossel and press the plunger a few times I can feel the gas enter the rubber plunger and it will start to squirt the gas. Have you seen this problem?? Do I need a new O ring and rubber pumper or what?? I have taken this carb on and off a bunch and cleaned through it several times.
Thanks for your help

Answer
Dave,

  Sometimes Cleaning causes dirt to enter many smaller parts of the engine you do have a Point with the O ring and Primer changing it out should solve your lil prime issue Normally this Plunger does not shoot gas into your carb assy it merely pressurizes the fuel intakes hence Priming the carbuerator for starting.
Vapors are ejected thru a smaller check valve as the liquid fills the bulb Overfilling or Overpriming will allow Fuel to shoot from the Hole into your Carb Intake But In a nutshell It is for fuel system pressurization think of it as a fuel Pump for your car.