What is the purpose of a breakaway device in a fuel dispensing system?

A breakaway device in a fuel dispensing system is specifically designed to minimize damage during a drive-off incident. When a vehicle accidentally drives away while the fuel nozzle is still attached, the breakaway device functions by disconnecting the fuel line safely. This prevents the nozzle and fuel hose from being pulled apart violently, which could lead to fuel spillage, equipment damage, and potential safety hazards such as fire. By allowing the nozzle to detach cleanly, the device protects both the fueling infrastructure and the vehicle, significantly reducing the risk of accidents or environmental contamination.

In contrast to the other options, regulating fuel flow, providing leak detection, and ensuring proper ventilation relate to different aspects of fuel system functionality and safety but do not specifically address the scenario of a vehicle moving off while still connected to a fuel dispenser. Thus, while those functions are critical in their own right, they do not pertain to the primary purpose of a breakaway device.