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A fuel dispenser system having a storage tank and a fuel delivery hose extending from the storage tank and terminating at a nozzle. A vapor recovery line extends between the nozzle and the storage tank. The vapor recovery line extends between the nozzle and the storage tank and has a section with a

A fuel dispenser system having a storage tank and a fuel delivery hose extending from the storage tank and terminating at a nozzle. A vapor recovery line extends between the nozzle and the storage tank. The vapor recovery line extends between the nozzle and the storage tank and has a section with a first larger diameter and a second section having a smaller diameter. A vapor pump is operatively connected to the vapor recovery line for moving vapor along said vapor recovery line. A chamber is positioned along the vapor recovery line and includes inlet and outlet ports, and a main sensor chamber. The inlet port connects to the vapor recovery line at a point having the larger diameter. The outlet port connects a point of the smaller diameter. Each of the ports connects to the main sensor chamber where a sensor is positioned for determining the vapor concentration.

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1. An apparatus for sensing the hydrocarbon concentration of a vapor flow in a vapor passage comprising:a. a sensor housing positioned adjacent the vapor passage so as to provide fluid communication with the vapor flow and to discourage entry of liquid into the sensor housing; b. a vapor inlet posit

1. An apparatus for sensing the hydrocarbon concentration of a vapor flow in a vapor passage comprising:a. a sensor housing positioned adjacent the vapor passage so as to provide fluid communication with the vapor flow and to discourage entry of liquid into the sensor housing; b. a vapor inlet positioned in the vapor passage for admitting vapor into the sensor housing; c. a hydrocarbon sensor mounted in a sensor chamber defined within the sensor housing; and d. a venturi mounted in the vapor return passage such that the venturi draws a portion of the vapor flow into the sensor chamber into contact with the hydrocarbon sensor.