What is a requirement for dispensing devices in self-service fuel stations when not in use?

Dispensing devices at self-service fuel stations must be set to the off position when not in use to ensure safety and prevent unauthorized use. This requirement helps minimize the risk of fuel leaks, spills, or fire hazards that could occur if the devices remain operational. Additionally, setting the devices to the off position protects customers and staff by ensuring that there is no unintended dispensing of fuel. While covering the devices may be a good practice for protection against environmental factors, the explicit requirement focuses on ensuring that the equipment is not actively dispensing fuel when it is not in use.