It will be obvious!!! It is part # 13376 Ratchet Restriction Tab, DO NOT try to eliminate part # 11686 Toolhead Ratchet Cam. Part # 12486, Cam Guide Bolt that holds in #11686 is the "do-hickie" that runs the primer feeding system.
So, in short, it is #13376 that is the culprit!!!
Thanks, I'll be on the lookout when I set it up.