Fuel cell operation with a failed open injector

A method for controlling a flow of hydrogen gas from a hydrogen gas source to an anode side of a fuel cell stack, said method comprising:

• reducing pressure of the hydrogen gas from the hydrogen gas source using an electrical pressure regulator based on a supply pressure provided by a supply pressure sensor positioned downstream from the pressure regulator;
• injecting the hydrogen gas from the pressure regulator into the anode side of the fuel cell stack using an injector based on an anode pressure provided by an anode pressure sensor positioned downstream of the injector, said supply pressure sensor being positioned upstream of the injector;
• determining that the injector is stuck in an open position based on the anode pressure as provided by the anode pressure sensor has increased above a predetermined pressure value;
• and
• controlling the flow of the hydrogen gas to the anode side of the fuel cell stack using the pressure regulator based on the anode pressure instead of the supply pressure if the injector is stuck in the open position, where controlling the flow of the hydrogen gas includes controlling the pressure regulator so that the flow of hydrogen gas through the pressure regulator is a pulsed flow.