Gnillits

I'm relativ new to this mod, so my question could be realy dumb, but i can't find any answers with google so: How can I produce Liquid Fuel and Oxidizer using an "All in One IRSU Refinery"? There should be enough power on my ship, because there is a "Molten Salt Reactor" on it with "Thermal Electric Generator" attached to it. I also have an "IFS Cryongenic Tank" with Liquid Water in it which is attached to the IRSU and a empty "Rockomax X200-32" which is also attached to the IRSU. The Tanks are also attached with External Fuel Ducts to the IRSU... Any idea to what am I doing wrong? Or is it just impossible to do this?