Under what condition is a balance type nozzle allowed to dispense fuel?

A balance type nozzle is designed to provide a safe and effective method of dispensing fuel while maintaining proper pressure and preventing spills. The correct condition under which this type of nozzle is allowed to dispense fuel is when the bellows is depressed.

This mechanism ensures that the nozzle operates safely by activating the flow of fuel only when there is a physical engagement with the bellows. When the bellows are depressed, it allows fuel to flow through the nozzle, taking advantage of the balance system that equalizes the vapor pressure in the tank and prevents accidental spillage or overfilling.

Other conditions, such as having the dispenser turned on, may not guarantee safe dispensing, as they might not activate the necessary mechanisms to prevent spills. An empty tank would not provide the necessary back pressure required for safe dispensing, which could lead to issues during the refueling process. Finally, if the nozzle is fully inserted into the fill pipe but the bellows is not depressed, fuel may not dispense, as the system requires the bellows to be engaged to allow for a proper flow.