Patent ID: 8191585

Claim:
For a fuel dispensing system for dispensing fuel from a plurality of dispensing nozzles into ORVR and non-ORVR equipped vehicles, the fuel dispensing system including a vapor recovery system, a method for monitoring for a restriction in the vapor recovery system comprising: determining over a period of time, for each dispensing nozzle, an ORVR penetration ratio of A/L ratios below a first threshold versus A/L ratios above the first threshold; flagging one of the dispensing nozzles if it is determined that there has been a series of detected A/L ratios at the one dispensing nozzle below the first threshold; upon completion of the period of time, determining an average of the ORVR penetration ratios of the non-flagged dispensing nozzles; determining an acceptable ORVR penetration ratio as a function of the determined average ORVR penetration ratio; comparing the ORVR penetration ratio of each of the flagged dispensing nozzles to the acceptable ORVR penetration ratio; and providing an indication for a given flagged dispensing nozzle if the penetration ratio for the flagged dispensing nozzle is greater than the acceptable ORVR penetration ratio.