homebrew nailed it on the advice. one more thing to add, though: when you refuel, turn the lighter to the LOWEST "-" position first.
if you don't do this, pockets of air can get trapped in the bladder (sounds like what's happening with yours, hog) and cause it to malfunction.
i had trouble with my colibris and thought they were a POS, but my tobacconist schooled me, and i've not had a problem since.
recap:
1. use only 3x refined (or above) fuel
2. bleed the bladder before EVERY refueling
3. turn to lowest "-" position before refueling
doing these 3 things should have your colibri humming right along for years.