Patent ID: 7625655

Claim:
A method for delivering fuel to and removing effluent from a fuel cell in a fuel cell system, comprising: (A) providing a direct oxidation fuel cell including a membrane electrode assembly; (B) coupling a container with said fuel cell, including: (i) providing within said container, a first inner bladder being substantially fully expanded upon being filled with liquid fuel, and having a fuel outlet conduit to supply liquid fuel to said direct oxidation fuel cell; and (ii) providing within said container, a second inner bladder for receiving effluent from said fuel cell through an effluent inlet leading from said fuel cell into said container as reactions occur in said fuel cell, in such a manner that as effluent enters said second inner bladder, said second inner bladder expands and contacts said first inner bladder to displace fuel out of said first inner bladder to said fuel cell, wherein the second inner bladder is not under application of force.