Where do I get a primer bulb for a garden line chainsaw and how do I fit i?

The primer bulb is to fit a carburetor - Amazon sell them.

Consider also that the fuel lines may have perished and be letting air enter where they should not.

Consider also that crud from the decayed fuel lines my have entered the carb.

Consider that a workshop service might solve your problems in one hit.

Good Luck...
October 2016