06622757 is referenced by 29 patents and cites 3 patents.

A method and apparatus for monitoring and determining fuel vapor recovery performance is disclosed. The dispensing of liquid fuel into a tank by a conventional gas pump nozzle naturally displaces a mixture of air and fuel ullage vapor in the tank. These displaced vapors may be recovered at the dispensing point nozzle by a vapor recovery system. A properly functioning vapor recovery system recovers approximately one unit volume of vapor for every unit volume of dispensed liquid fuel. The ratio of recovered vapor to dispensed fuel is termed the A/L ratio, which should ideally be approximately equal to one (1). The A/L ratio, and thus the proper functioning of the vapor recovery system, may be determined by measuring liquid fuel flow and return vapor flow (using a vapor flow sensor) on a nozzle-by-nozzle basis. The disclosed methods and apparatus provide for the determination of A/L ratios for individual nozzles using a reduced number of vapor flow sensors. The disclosed methods and apparatus also provide for the determination of fuel dispensing system vapor containment integrity, and the differentiation of true vapor recovery failures as opposed to false failures resulting from the refueling of vehicles provided with onboard vapor recovery systems.

Title
Fueling system vapor recovery and containment performance monitor and method of operation thereof
Application Number
9/725727
Publication Number
6622757 (B2)
Application Date
November 30, 2000
Publication Date
September 23, 2003
Inventor
Richard K Lucas
Enfield
CT, US
Robert P Hart
East Hampton
CT, US
Agent
Withrow & Terranova PLLC
US
Assignee
Veeder Root Company
CT, US
IPC
B65B 31/00
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