Abstract: The present invention relates generally to the commercial distribution and sales of volatile motor fuels and more specifically to systems and methods for ensuring leak free storage of both liquid and vapor phase states of fuels stored at dispensing facilities. In addition, the present invention presents a simple means for measuring evaporative loss rates from fuel storage systems. Moreover, this invention provides a means for determining proper functioning of Stage I and Stage II vapor recovery techniques.

Abstract: An apparatus and method for ensuring effective and efficient vehicle vapor recovery performance, storage tank system integrity relative to both vapor and liquid containment and for reducing the probability that inaccurate information causes companies to undertake unnecessary, expensive and wasteful loss investigations at gasoline dispensing facilities. A fuel storage and delivery system is transformed from an “open system” communicating directly with the environment to a “closed system” which ensures capture, containment and accurate accounting of both hydrocarbon vapors and liquid phase product.