Abstract: A fuel nozzle adaptor conformed for attachment to the end of a gasoline dispensing nozzle and comprising a convolved tubular body adapted to receive the end of the nozzle at one end thereof. Formed around the periphery of the nozzle receiving end of the adaptor is a circular groove having one radial port communicating with the interior thereof. Inserted in the port is a hollow pin having a flat exterior surface. A circular spring clip is placed within the groove urging the pin into the interior of the radial bore. The pin is therefore available for locking into the overflow sensing port of the nozzle with the interface between the exterior end of the pin and the circular spring clip providing a gas communication path to the interior.