Quote Originally Posted by EuropeanAM View Post
1. Could be the bulb, anti-siphon valve, OR an air leak between the fuel level and the bulb.

2. Could also be TOTALLY unrelated to fuel (Crank sensor or Flywheel/Reluctor wheel rusty-flaked paint). Tends to cause an "I think I can I think I can, nope... well maybe" on some cold or restarts.
Thanks Don! I might take the cowling off again in the garage where it's quiet and no wind, see if I can pinpoint an air leak. If not, correct me if I'm wrong, it looks like the OEM primer bulb replacement is part # 8M0061875.