The LFP separator is junk. Its a water separator that you're using to separate oil. It'll suck up the oil thats sitting in your lower intake and thats about it. Thats why it filled up really fast then stopped. It'll filter out a little bit for a few weeks, then slowly filter less and less. Its good for a temporary patch, but not a permanent solution.
Order a L&S separator that works 100% and be done with it forever.