Fuel cell systems and methods for controlling the operation of components of the fuel cell system, which may include a fuel source (46) and a fuel cell stack (24). In some examples, a fuel source (46) is adapted to provide supply fuel to a fuel cell stack (24) at a supply pressure, the fuel cell stack (24) produces electric current at a production amperage. In some examples, a control system (80) is adapted to control operation of the fuel cell stack (24) based on a pressure detected at the fuel celll stack (24). In some examples, a target production amerage is determined based on the detected pressure, such that when electric current is producted at the target production amperage for the detected pressure, the fuel cell stack (24) consumes a predetermined proportion of the supply fuel.