On the 06 Breva 1100, there are two pipes coming from the tank. One vent, one overflow? I thought that they both terminated at the top of the tank in the fuel filler assembly. On one side of the assembly there is a hole for overflow...on the other side a little plastic protuberance that I imagine is the venting connector.
I tied both tubes to a t fitting and then over to the tube that goes down the inside of the footpeg backet and is routed down the CARC arm.
Here's the interesting thing that is happening: I start the bike and let it idle in the driveway while I put on my gear...only a minute or three of idling. Somehow I have fuel dripping from the tube attached to the CARC arm. I can only surmise that on my last "fill up", a bit of fuel found its way into the overflow tube (where there is a low spot in the routing) and sat there until a vacuum was created by the vent tube. I mean it looks like it would drip until the tank was emptied, but isn't any way that the dripping is fuel is being pulled from the bottom of the tank!!?
I'm going to separate the two pipes anyway... The overflow I will keep tied to the tube going down the side of the bike to the CARC with a one-way valve installed...the vent tube will be routed somewhere else, out of harm's way. There's so much empty space under the seat on that bike!