I was having that issue with my Ego at the beginning as well, I find that if I pull out the filler, fill the cart with about 8 drops (on a standard size cart) and then put in the filler, pushing it with my tweezers, all the way down, put in some more drops, about 4, pull up the filler to the top with just a tad sticking up so it will get to the atomizer and make sure that the filler is wet, not dripping but wet, I'm good to go. I was putting about 3 drops in the atty and found it 'dripped alot' through the base near the manual button, so I only prime with one drop now.... I've had to 'play' with it to get it to a 'science' but I'm there even with the Ego Mega Carts with Mega Atty....I can fill both of mine in 1 1/2 min. LOL...or less...hee hee...as much time as it took me to grab a smoke, my lighter and go into the garage or out to the deck...don't get frustrated....it's a matter of working with it to get it just right for you.