New day, new question on my 60K mile R1100RS maintenance project.
I've pulled the tank and am replacing all fuel lines along with the filter. I'm also trying to figure out how to deal with the evap system which consists of the two vent lines coming out of the tank and into the charcoal canister system. The previous owner already eliminated the canister and external vent tubes. He left me with the 2 vent lines dangling out of the tank and draining any excess gas or vapor to the air/street.
That is the neck of my filler tube. It looks like one of the vent tubes is simply an overflow drain from the inside of the tank, and the other tube drains any overflow from the neck during filling.
Are there any established techniques to simplify this system? It seems like I need some kind of simple vent to allow for expansion/contraction with temperature changes. Additionally, I've heard of people trimming this tube back to allow for a more proper fill of the tank.