Vapor recovery unit systems (VRU) have become essential in mitigating volatile organic compounds (VOCs) emissions from fueling stations, which are significant contributors to urban air pollution. This paper explores the two main types of vapor recovery systems—Stage I and Stage II—discussing their mechanisms, efficiency, and regulatory landscape across various countries. Real-world examples from the United States, Europe, Canada, and Australia illustrate the practical applications of these systems. The benefits of implementing a VRU, not only enhances the environmental quality but also promotes public health and regulatory compliance. Through a comprehensive analysis, this paper underlines the importance of vapor recovery technologies in achieving a sustainable fuel delivery system.