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A fuel dispenser includes vapor and hydrocarbon concentration sensors positioned in the vapor recovery line to provide accurate feedback relating to the speed and concentration of hydrocarbon laden vapor recovered by a vapor recovery system. The sensors provide diagnostic information about the vapor

A fuel dispenser includes vapor and hydrocarbon concentration sensors positioned in the vapor recovery line to provide accurate feedback relating to the speed and concentration of hydrocarbon laden vapor recovered by a vapor recovery system. The sensors provide diagnostic information about the vapor recovery process as well as insuring that the vapor recovery process is carried out in an efficient manner. Additionally, the sensors may be positioned in an underground storage tank vent apparatus to monitor fugitive emissions from the underground storage tank.

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1. A fuel dispenser having a vapor recovery system comprising:a) a fuel delivery system adapted to deliver fuel along a fuel delivery path from a storage tank to a vehicle during a fueling operation; b) a variable speed vapor recovery system having a vapor recovery path to deliver vapors expelled fr

1. A fuel dispenser having a vapor recovery system comprising:a) a fuel delivery system adapted to deliver fuel along a fuel delivery path from a storage tank to a vehicle during a fueling operation; b) a variable speed vapor recovery system having a vapor recovery path to deliver vapors expelled from the vehicle to the storage tank when fuel is delivered during a fueling operation; c) a vapor flow sensor for determining a flow rate in said vapor recovery path; d) an infrared vapor sensor bearing on hydrocarbon concentration within said vapor recovery path, wherein both of said sensors are associated with said vapor recovery path; and e) a control system for controlling said variable speed vapor recovery system, said control system coupled to said vapor flow sensor and said vapor sensor and adapted to determine the amount of vapors recovered through said vapor return path according to a flow rate and a measured hydrocarbon concentration within said vapor recovery path and further adapted to control the efficiency of the recovered vapors by the vapor recovery system in said vapor recovery path.