Hi, looking at the VFR400 NC30 manual for the carberators and im not sure where the tubes labeled 12 and 11 is supposed to go to. Part 11 is labeled as the fuel tube and part 12 is labeled as the air bent tube. I attached an image of this part of the manual. Thanks.

https://imgur.com/a/yu6trkI

My suggetion are, 12 are vent (Bent) tubes that terminate free standing at rear of carburetors and 11 is fuel feed tube from fuel tank tap. Hope that helps.