Hello,
I was not able to get the Liquid Supplier Pipe working with a Forestry Still and a normal Supplier Pipe to provide Saplings to a Fermenter.
The Liquid Supplier Pipe only provides 100mB of liquid to the machine whichever is the quantity of liquid to supply I select in the GUI.
The Supplier Pipe seems to only work sometimes, and sometimes stops working randomly.

You probably need to update your forestry version. What tank is the liquid comming from?

The liquid is coming from a Railcraft Iron Tank. The saplings are coming from a Diamond Chest (from the Iron Chest mod).
Forestry is updated to the last version.

Update LP to the newest build. That should fix RailCraft tank support.

Ok, it is fixed.
The problem with the saplings is still there :(
Here's a screenshot with my pipes configuration, in case I am doing something wrong.

I'm sorry, I just noticed that Forestry has got his own ID for saplings, to implement all the genetics thing, and as I built that map in creative, I just put a vanilla sapling into the supplier from the creative inventory.
Thank you very much for your help!

Glad I could help.
By the way, nice pic. :-)