Originally Posted by Dorzok
you try running the bike with the cap open? sounds like you're creating a vacuum inside those auxillary tanks and it's not letting the fuel flow. might be why it pumps in a bucket but not when you stick it in a closed system.
Just found your RR and was about ready to post the same thing. When I installed a larger tank on my Honda 650 the fuel cap was not vented. It had a hose but the center of the cap was not drilled out and it would run about 3 mins at idle and die every time.