Hokie, my plan was to basically do what you said. My hope is that the cylinders will push any air into the lines when in the fully open or fully closed position (cause really where else can the air go?). I bought a syringe last night (based on what I think was one of your earlier posts). Once the air is in the lines, I'll disconnect the lines from the cylinders, push fluid through the lines with the syringe to push the air out, reconnect, re-check the fluid in the pump reservoir, cycle and repeat until the air is gone. I like the idea of keeping the open end of the line in a container of fluid to make sure I don't accidentally suck in air and ruin my work. I'll let you know how it goes...hopefully by Monday you'll have an answer.