Let's see, the gear holds .75L (~1.6 pint) but I don't see a specification for the system. The reservoir is pretty small, maybe a half pint? Then there's the lines. You just fill it bit by bit until it's full. You can use a vacuum pump and a #11 (I think) stopper to draw air out of the system but it will work itself out over time, probably puking some foamy fluid out of the vent cap in the process though.