Fuel reactant leak detection system and method of detecting fuel reactant leaks

A fuel reactant leak detection system for a vehicle having one or more fuel cell modules, a fuel supply source to supply a fuel reactant to the one or more fuel cell modules via a high-pressure fuel supply line, wherein the fuel supply source is to supply the fuel reactant to the one or more fuel cell modules at a pressure substantially the same as a pressure at the fuel supply source, a fuel supply valve configured to open and close fuel reactant flow through the high-pressure fuel supply line, and one or more pressure sensors, operatively connected to a computing device, and configured to detect pressure in the high-pressure fuel supply line downstream of the fuel supply valve at a region between the one or more fuel cell modules and the fuel supply valve, the vehicle fuel reactant leak detection system comprising:

• the computing device, operatively connected to the fuel supply source, having one or more processors and a non-transitory memory operatively coupled to the one or more processors comprising a set of instructions executable by the one or more processors to cause the one or more processors to:
• conduct, in response to a detection as sensor data of pressure in the high-pressure fuel supply line when the vehicle engine is in a non-operating state, fuel pressure analysis of the sensor data;
• and
• detect, based on the fuel pressure analysis, leakage of the fuel reactant at the fuel supply valve.