That schematic is hard to understand because it doesn't seem to shiow exactly what i see on the bike. The valve i spoke of for example has one end where the hose attaches from the float vent tube and on the other end of the valve there is an unattached opening. yet i don't see that in the schematic. I tried blowing in the hose that attaches to the vent T fitting and turning the ignition on annd off, and sure enough when the ignition is on i can blow thru it and feel the air coming out the nipple on the other side. then it closes when i turn the key off. Thats why i have a hard time exatly understanding whats going on by looking at the schematic. Not just that, but there are other things that didn't seem to match on the bike. The manual shows a different system for the 790, but i wonder if there are even more variations. If you look at the OEM parts exploded view there are 2, and one is like mine and shows the valve with a hose on one end and nothing on the other, but the manual schematic doesn't show that, and mine at least doesn't have a exploded view. Cool thing about the bikebandit OEM parts exploded views is that they use dotted lines to indicate what part attaches to another. So you can see the valve is hosed at one side and open at the other. When i first noticed that unused nipple i wondered if theye was supposed to be a hose on it. The manual didn't tell me that but bthe oem parts did ! That bikebandit resource is great ! More than just part numbers and prices.......the exploded views go beyond what the manual shows by indicating what goes where.