Small Engine Parts
Walbro Primer Bulbs
About Walbro primer bulbs:

The primer bulb is one of the most common parts to fail on
diaphragm carburetors for small engine applications. Often the
primer bulb hardens and cracks causing a loss of vacuum
under the bulb. If you suspect that your primer bulb is faulty
but there are no visible signs of cracking, try inspecting the fuel
line inside and outside the tank. Another possibility could be a
plugged fuel filter inside the tank.

Replacing a Walbro primer bulb is a simple process that
requires removing the metal housing holding the primer bulb in
place. This is usually accomplished with a small Phillips screw
driver. After removing the old primer bulb, make sure the area
under the housing is clean before installing the new bulb. Any
dirt or material from the old primer bulb remaining in the
housing could also cause the new bulb to not seal properly
around the edge.

There are several different types and sizes of Walbro primer
bulbs and it is essential that the correct bulb is used for
replacement. There are also external mounted Walbro primer
bulbs that attach to the equipment and have separate fuel lines
to the carburetor and fuel tank. Failure of these external type
primer bulbs can be a failure of the fuel lines behind the bulb
assembly and not the bulb itself.
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