Haha, no sucking required. If you search for Baditude's Blog posts, he's got a great tutorial on how to do it so that it works every time. It doesn't take long, and no sucking required. lol.
I use a variation of his method. I have some 18ga needle-syriges that I use to slide down the outside of the filler, basically between the wall and the filler. I gently push liquid in while slowly removing the needle. This way it dispenses liquid throughout. After this, I top off and thermometer-shake, per his method to finish up. Just saves more time.