TKG i cant agree with that more. If your unsure of the order of the parts refer to this site

http://web.archive.org/web/200501161...ro/family2.asp

Select your carb and there will be a parts diagram expanded view.

Ok here is some info straight from the FAA Airframe and Powerplant Mechanics Handbook. EA-AC-65-12A

Notice there is no mention of vacume and there is talk of pressure differential.

The only difference of this carb and a walbro is the diaphram seperating the fuel and atmosheric air and diaphram position opens and closes the needle which is the same as fuel bowl level opening or closing it. by the way add a diapram to this carb like a walbro and now you have an inverted flight negative g carb.

I spent 13,000 to learn this in 94 and now I give it to you for free

Sorry about the cropping as its the only way I could get it to load readable size.