I know that is difficult to find a solution, due to the number of parts of the kayfun. And I really am grateful to you guys, for trying to help me.
I used 1 and 2 wraps of floss. If I put the third, the JFC don't close.
If I cover 3 of the 4 holes and blow, there is no sign of liquid.
The Chimney o-ring is in place.
My draw used to be tight, know the airflow screw is screwed +- 20% (I unscrew until it is flush with the center pin, then I screw two turns).
I opened now the base, and look what I saw:
Is supposed to be flooded?