Hydrogen generator system with liquid interface

A hydrogen generator system comprising:

• a replaceable cartridge that is removably contained within the system, the cartridge comprising:
• a cartridge housing;
• a liquid reservoir disposed within the cartridge housing and configured to contain a reactant liquid comprising a reactant;
• a reaction area disposed within the cartridge housing and within which the reactant reacts to produce hydrogen gas;
• a liquid flow path disposed within the cartridge housing and through which the reactant liquid can flow from the liquid reservoir to the reaction area;
• and
• an internal pump disposed within the cartridge housing and configured to transport the reactant liquid through the liquid flow path, the internal pump being operated by a fluid;
• an external pump disposed outside the cartridge housing and in flow communication with a source of the fluid, and configured to pump the fluid to operate the internal pump;
• and
• a line configured to convey the fluid between the external pump and the internal pump;
• wherein the fluid is air supplied by the environment.