In a balance system, which of the following is NOT involved in returning vapor to the underground tank?

In a balance vapor recovery system, returning vapor to the underground tank involves several components that work together to ensure efficient operation. The correct response indicates that the inner hose is not involved in this specific function.

Inner hoses are primarily responsible for transporting liquid fuel from the underground storage tank to the dispenser. While they do play a crucial role in the overall fuel delivery system, their purpose is not to facilitate the return of vapor to the underground tank. In a balance system, other components—like the breakaway valve, bellow, and dispenser vapor piping—are specifically designed to manage and return the displaced vapor created during the dispensing process.

The breakaway valve ensures that the connection between the dispenser and the vehicle can safely disconnect without causing damage or losing vapor. The bellow, often used to absorb movement and allow flexibility, helps in accommodating vapor movement. Meanwhile, dispenser vapor piping is directly involved in channeling the vapor back into the storage tank. Thus, while each component has a role within the vapor recovery system, the inner hose's primary function is to deliver liquid fuel, not to return vapor to the underground tank.