I have bought a few new aftermarket caps for $7, then they were $15... too much as they all perish after time.
It's only a primer, so I used a piece of tubing to first blow then suck to get some fuel to prime. It worked.
Then I put a Brigs & Stratton primer bulb in, had to be careful pushing it in, and it's not glued or melted in. But it hasn't come out and has lasted a year.
I felt ripped off.
speedy

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........................Keep your blades sharp......................