124. After performing repairs on the fuel injection system or governor of a main propulsion diesel engine on your fishing industry factory ship, what precaution should be taken prior to starting the engine?

After repairs to a diesel engine's fuel injection system or governor, ensure the ability to immediately cut off the fuel and/or inlet air supply to prevent overspeeding. This is the only reliable method to stop an engine experiencing uncontrolled acceleration, as removing air or fuel will halt combustion regardless of electrical power or lubrication.