Good day. I bought a 2002 1800 C that has a 2005 1800 F tank. I have had this bike apart for over a year and finally getting it back together. As I was putting on the tank I realized that the tank has what I believe 3 vent ports. On the bike I have a small line with T that goes to the smallest port and a larger, about 3/8" OD that goes to the bent port. There is one port that is about 3/8" straight down and no apparent line on the bike for it. What is this and is there supposed to be a line for it? Thank you in advance.