about half (or less) of the replacement oil into the funnel. it will just sit there! gravity is not worth a damn for filling the fork tubes, unless you are very patient!
so, we are going to help things along with the fork action.
6) hold the front brake lever, pull back slowly on the handlebars, unloading the forks. you will see the fluid level in the funnel go down quickly as the suction pulls fluid into the forks. slowly let the forks return to the "neutral" position from the weight of the bike.
7) now, still holding the brake lever, push down on the handlebars slowly. you will see air bubbles come 