Many users here could write volumes of info but rather than repeating what has been written and discussed in detail before, I thought I'd suggest some links here. When I tried a search for the subject here on RCU the search function failed to work. So I went to Google and entered the following words "Walbro Carb Fuselage Vent" and pages of info came back. Rather than me repeating something here, try that yourself and I'm sure you will find what you're looking for.

Go read a bit and if you have any specific questions, come on back and I'm sure you can get them answered.