with the tank empty, and fully assembled, position your fingers over the air inlets, and blow firmly through the drip tip. If you hear audible air hiss, it's usually a missing seal. Otherwise, it's wicking...it's earlier iteration had a certain "knack" to the wicking, and this could be sinilar.

Regardless, if you don't have the earlier version, don't miss out - one of the very best in my collection, easily beating most of the better-known "heavyweights".