A system and method for controlling or otherwise effectively parameterizing the delivery of fuel to a fuel cell device comprises a fuel pump (330), a mixing chamber (310), a fuel concentration sensor (350), a control device (360), a pump driver (370) and a pulse generator (380). Various features and parameters of the present invention may be suitably adapted to optimize the fuel transport function for any particular fuel cell design. The present invention provides inter alia improved control of delivery of methanol to a DMFC fuel solution.