Before removing a fuel hose from an engine, what should be done to the solenoid operated fuel valve?

To ensure safety and prevent fuel spillage or fire hazards when removing a fuel hose from an engine, the solenoid-operated fuel valve should be closed while there is battery power. This action stops the flow of fuel from the tanks to the engine. By closing the valve, you effectively isolate the fuel system from the engine during maintenance. After the valve is closed, disconnecting the battery serves as an additional safety measure to ensure that the solenoid cannot be activated inadvertently while working on the fuel system.

This procedure is crucial as it helps maintain control over the fuel system and minimizes the risk of accidental ignition or fuel leaks that could occur if the valve were left open or the battery remained connected.