California ICC UST Service Technician Practice Exam

Which of the following components is NOT part of Stage II Vapor Recovery Systems?

1. Vacuum-assist nozzle

2. Pressure relief valves

3. Storage tanks

4. Gasoline pumps

The correct answer is: Pressure relief valves

Stage II vapor recovery systems are designed to capture gasoline vapors during the refueling process at service stations. These systems help minimize air pollutant emissions and improve air quality. The components that are integral to this system include specialized nozzles, like vacuum-assist nozzles, that help draw vapors back into the storage tank during refueling. Gasoline pumps are also essential, as they are the primary equipment used for dispensing fuel, working in conjunction with the vapor recovery system to prevent the escape of harmful vapors into the atmosphere. Storage tanks are key elements of Stage II systems, serving as the receptacles for both fuel and collected vapors. Pressure relief valves, while important in various parts of the fuel system for maintaining safety and preventing excessive pressure buildup, are not specifically part of the Stage II vapor recovery system itself. Thus, they do not directly contribute to the function of vapor recovery during the refueling process, making them the correct answer in this context.