What does onboard refueling vapor recovery (ORVR) do during a fuel delivery?

Onboard refueling vapor recovery (ORVR) is a technology designed to capture and manage fuel vapors produced during the refueling process of vehicles. When fuel is added to a vehicle, vapors increase as the fuel displaces the air in the fuel tank. ORVR systems are designed to trap these vapors in the vehicle's onboard storage system, preventing them from being released into the atmosphere.

The key function of ORVR is to ensure that these vapors do not escape into the environment, thus reducing air pollution and improving fuel efficiency. By capturing and storing the vapors for reuse, the system minimizes the overall emissions associated with refueling. This is essential for meeting environmental regulations and for the broader goals of reducing harmful emissions from gasoline vapors.

In contrast, the other options imply different methods of handling fuel vapors. Trapping vapors in the delivery truck and disposing of them immediately does not align with the purpose of ORVR since ORVR specifically focuses on the vehicle's onboard system. Releasing vapors into the atmosphere contradicts the very aim of vapor recovery technologies, which is to prevent such emissions.