Hey Klaus,

seen from the front the upper connection is FUEL-IN. The one below (to which it seems you connected the fuel line) is an overflow connection).

Check the Mikuni scans in the download section page 8.
Here from an old write-up:

On the carb`s front there are 2 (movable) "T" pieces (connecting both single carbs). The upper one is the fuel inlet coming from the fuel-pump. In this fuel-line (before the carb) there must be a "Y" piece leading excessive fuel back to the tank (rear connection pipe of the tank, the one before it is the tank breather). The lower "T" is an output which leads to a little fuelresistant cannister attached to the frame (left side).
(I used a little metal can [from kitchen spices]. Drilled a hole on top for the tube to enter and 2 little holes on the bottom so fuel could exit)

Gerhard

Hi Guys

Thanks for your responses. I found the below link which was very helpful. Happy New Year.

http://forums.ducatipaso.org/viewtopic.php?name= ... light=hose