Attached the fuel vent tubes to the wing ribs using mill fiber. I also clamped the tip ends of the tubes up to the underside of the spar cap with a deep cleco clamp and packed mill fiber around the tube to hold it in position. I will cover the mill fiber and tube with a two ply laminate later.
I filed the ends of the vent tubes to protect them from being blocked with any resin drips during wing close.
Vent Tube with mill fiber fillet attaching to the rib