So even in the face of a complete station blackout—you don't have any power at all—there are methods for using the steam-driven pump to continue to keep cooling going.

In order to achieve power steering function in fuel cell bus, an electrohydraulic system is proposed, where the pump is directly driven by a DC motor through an axis coupler.

This series of pump is mainly driven by marine diesel engine. Those with smaller power may also be driven by motor.