What must happen to the fueling system in the event of a pull-away?

In the event of a pull-away, it is crucial for the fueling system to cease to flow. This is a safety mechanism designed to prevent accidental fuel discharge, which could lead to dangerous situations such as spills or fires. When a vehicle pulls away from the fueling station, the system is engineered to automatically stop the flow of compressed natural gas to mitigate any risks associated with an unintentional disconnection.

The ability to immediately halt the flow is essential not only for safety but also for compliance with regulations governing CNG fueling systems, which prioritize preventing hazardous conditions. While other options might suggest additional safety features, the immediate requirement in the context of a pull-away situation is that the fuel flow stops instantaneously to protect both personnel and infrastructure.