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What does a fuel solenoid do on riding lawnmower?

A fuel solenoid is a valve used to control the flow of fuel to the engine of a riding lawnmower. When the solenoid receives a signal from the lawnmower's ignition switch, it opens to allow fuel to flow to the engine. When the ignition switch is off or the engine fails to start, the solenoid closes to prevent fuel from flowing. The fuel solenoid is designed to prevent fuel from flowing into the engine when it is not needed, and can help extend the life of the engine.