Thanks Dave!
I took the carb off the base and this is what I found
Real thick gasket (insulator?)
[URL=http://s1035.photobucket.com/user/mendonjo/media/image_zps68465d81.jpg.html]Gasket[/url]
I bet this is the passage that is not supposed to be blocked
[URL=http://s1035.photobucket.com/user/mendonjo/media/image_zps87d66656.jpg.html]Bottom side of carb[/url]