The weak link in small engine reliability is the primer bulb. The root cause is the susceptibility that this rubber component and rubber fuel lines have to degrade and deteriorate from reaction to ethanol based fuels.

In this video I demonstrate the trick to removing your old primer bulb assembly and replacing it with a new part that can be bought through Home Depot or Amazon. The conclusion is that the primer bulb can't be removed from the outside. You need to get access to be back side of the primer bulb assembly from the inside of the carburetor housing. Watch the video for the trick to this procedure.