so we went to fill it up again on saturday and same problem with the pump clicking off. learn from my mistake and dont think you can just disconnect a few lines while the tank is lowered without disconnecting everything. just take it all the way out the first time and clean the hoses. wife and i did that sunday. dropped it out, blew out all the lines (and got a LOT of charcoal out again) until they were flowing substantial air out. reinstalled and it filled up like a dream. what an annoying problem.