If you just sucked on it, you didn't prime it properly. It takes a few minutes to prime a cartomizer. You need to fill it with liquid until it just about comes out of the bottom, where the conductor is located. If you put liquid directly in it and it goes in the center hole, it will come out of the bottom before it completely primed. Hold it a little diagonally, and fill it gradually while rotating it. I do this until the liquid starts to come out of the holes located on the tube that allows it to wick while you use it in the tank. I let it sit for a moment and top it off. Then, it's ready. You can always check it before you fill your tank to see if it's firing off correctly.
At least you know your juice will wick with the filler. I had a lot of trial and error till I found a cartomizer that wicked properly with my liquid. I just ordered slotted cartomizers, so I guess I'll be finding out soon if I wasted my money on those. If priming it properly doesn't compact the filler enough for your liquid to not pull straight through it and out the cartomizer, than you may need to get cartomizers with single punched holes, or get unpunched, and do it yourself. It could very well be that the wick isn't rolled tight enough, or the material isn't right. If so, you need another cartomizer.
If that isn't the issue, then the only thing I can think of is that the air holes at the bottom of the cartomizer by and on the conductor have too much pressure, and putting negative pressure on it is creating a vacuum. I don't see how that would be occurring though.