What does the Fuel Check Valve check ensure during pre-flight inspections?

The primary function of the Fuel Check Valve is to prevent backflow of fuel from one engine to another, ensuring that fuel pressure from an operating engine cannot impact the fuel system of the opposite engine. This is particularly crucial in twin-engine aircraft like the CRJ, where each engine's fuel system must operate independently to maintain overall safety and efficiency.

During pre-flight inspections, checking the operation of the Fuel Check Valve helps confirm that there are no leaks or malfunctioning components that could lead to an imbalance in fuel distribution or pressure, which could jeopardize engine performance. By ensuring that the operating engine's fuel pressure does not affect the other engine, the check valve contributes to the reliability of the aircraft's fuel system, maintaining the proper functioning of both engines in flight.