Define “leak detection” in relation to motor fuel systems.

Leak detection in relation to motor fuel systems refers specifically to the process of identifying unintended fuel losses from storage systems. This involves monitoring the integrity of storage tanks, piping, and dispensing equipment to ensure that fuel is not escaping into the environment, which could lead to hazardous conditions, environmental damage, and financial losses.

Effective leak detection systems use various methods, such as pressure testing, vacuum testing, and electronic monitoring systems, to promptly identify any breaches or leaks. By accurately detecting leaks, operators can comply with safety regulations, minimize environmental risks, and maintain the supply chain's efficiency.

The other options, while relevant to fuel management and safety, do not accurately define leak detection. Refiling tanks relates to supply management, inventory management involves tracking fuel levels for operational efficiency, and cleaning fuel spills pertains to spill response rather than the proactive identification of leaks. Thus, option B is the most accurate representation of leak detection in motor fuel systems.