One hose from the carb is, of course, for the gas from tne tank. The other two hoses coming from the carbs are overflow and just drop straight down to the bottom of the frame - they do not connect to anything. Additionally, there is - at least on my ´82 - another hose from the tank´s fuel guage that also drops down apparently as a breather - and connects to nothing. -Hope this helps. I´m nuts about my bike!