An EVOD shouldn't leak like that - and they're basically exactly the same as an MT3!
The only time I've seen leaks are
a) If you got juice in the tube - but that would be all gurgly, etc...
b) If the coil is not screwed in tight- same thing though, you'd have signs of juice in the tube before it was time to turn over and fill. Still, you should check that the coil is snug whenever you're filling. Sometimes, they seem to loosen during use
c) If it's actually broken - the mouthpeice can get a crack, often caused by over-tightening the base. The way the coil's tube pushes "up" on the rest of the tube, that's attached to the plastic tip, you can crack it. That's the only real way to kill an EVOD for good.
This is a "real" Kanger EVOD, and the right coil/heads?