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A device for detecting the presence of an ORVR-equipped vehicle having a fuel tank filler pipe including an annular vapor block mounted in the fuel tank filler pipe. The vapor block has sufficient length to substantially block vapor flow through a plurality of vapor return openings in a vacuum assis

A device for detecting the presence of an ORVR-equipped vehicle having a fuel tank filler pipe including an annular vapor block mounted in the fuel tank filler pipe. The vapor block has sufficient length to substantially block vapor flow through a plurality of vapor return openings in a vacuum assist nozzle spout and further includes an internal diameter complementary with the outside diameter of the nozzle so as to prevent the creation of a vapor tight seal.

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[ We claim:] [1.] A system for detecting the presence of an ORVR-equipped vehicle having fuel tank filler pipe comprising:a) a vacuum assist nozzle having a plurality of vapor return openings;b) a fuel dispenser connected to the vacuum assist nozzle and having a vapor return path extending from the

[ We claim:] [1.] A system for detecting the presence of an ORVR-equipped vehicle having fuel tank filler pipe comprising:a) a vacuum assist nozzle having a plurality of vapor return openings;b) a fuel dispenser connected to the vacuum assist nozzle and having a vapor return path extending from the nozzle to a vacuum pump capable of maintaining a vacuum level;b) an annular vapor block adapted to be mounted in the fuel tank filler pipe, the vapor block having sufficient length to substantially block vapor flow through the plurality of vapor return openings in the vacuum assist nozzle spout to the vapor return path, the vapor block further including an internal diameter complementary with the outside diameter of the nozzle so as to prevent the creation of a vapor tight seal whereby the vapor block causes an increase in vacuum level in the vapor return path; andc) a controller mounted in the dispenser for monitoring the vacuum level in the vapor return path and modifying the operation of a vacuum pump responsive to a change in the vacuum level.