California ICC UST Service Technician Practice Exam

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What is the purpose of Stage II vapor recovery systems?

  1. To reduce vapor emissions during refueling

  2. To increase fuel tank capacity

  3. To monitor fuel quality

  4. To prevent fuel theft

The correct answer is: To reduce vapor emissions during refueling

Stage II vapor recovery systems are designed to capture and contain gasoline vapors that are released into the atmosphere during the refueling process at gasoline dispensing facilities. When fuel is pumped into a vehicle, not only does the liquid fuel flow into the tank, but air and vapors must also escape from the vehicle's fuel tank. If these vapors are not managed properly, they can contribute to air pollution and are harmful when released. The key function of Stage II vapor recovery systems is to mitigate these harmful vapor emissions by drawing the vapors back into a storage tank for reuse, thereby preventing them from escaping into the atmosphere. This system is particularly important in areas designated as non-attainment zones for air quality standards, where reducing emissions is crucial for compliance and public health. Other options focus on different capabilities that Stage II vapor recovery systems do not address, such as increasing tank capacity, monitoring fuel quality, or preventing theft. Each of these functions serves distinct purposes and does not relate to the primary objective of vapor recovery systems, which centers solely on emissions reduction during the refueling process.