Hope someone can help. My CBR 600 FY is heavily vacuuming the fueltank after riding. The other day it finally cut out after a long ride, only restarting after opening the tank filler cap. Can someone point me to where this vent to relieve this pressure should be. I have checked around the filler and can't work it out.

Luke

 

hopefully you have solved your problem, but if not, i believe the fuel tank vent is on the underside and is the smaller of the 2 hoses.