When does the solenoid on the 58AF-3 pressure control valve energize to close the valve?

The solenoid on the 58AF-3 pressure control valve energizes to close the valve under specific operational conditions. The correct choice, indicating that the solenoid activates whenever fuel is running, reflects a fundamental aspect of how pressure control is managed in fuel systems.

When fuel is running, the system needs to adapt dynamically to changes in pressure and flow to maintain proper operation and safety. The solenoid's role in this context is crucial; it helps prevent overpressure conditions by closing the valve, thereby regulating the fuel flow and ensuring that the system operates within its designed parameters.

The other scenarios, such as the valve closing when all fuel pumps are deenergized, or through actions related to magnets on specific switches, do not accurately describe the primary function of the solenoid in relation to fuel flow. The system is designed to react to active conditions such as fuel flow rather than waiting for pumps to be turned off or external magnetic inputs. This design ensures immediate response to maintain safety and efficiency during fuel operations.