Fuel dispensing nozzle

Claim 1

In a fuel dispensing nozzle for filling a fuel tank, said nozzle having a spout, a fuel conduit leading to the spout, a vapor return line associated with the spout for withdrawing displaced vapors from the fuel tank being filled and transporting them to a remote vapor collection system, a fuel valve for controlling the flow of fuel through the conduit, an aspirator line having its tip located with respect to said spout so as to be in communication with the interior of the tank being filled when said spout is inserted in the fill pipe, means for producing a negative pressure in said aspirator line and pressure sensitive means in communication with said aspirator line for closing said fuel valve when a predetermined negative pressure exists in said aspirator line, the improvement which comprises an aspirator valve in said aspirator line located between said tip and said means for producing a negative pressure, and pressure actuable means in communication with said aspirator line for controlling said aspirator valve, said pressure sensitive means being in communication with said aspirator line between said aspirator valve and said means for producing a negative pressure, said pressure actuable means being arranged to respond to both negative and positive pressures in said line and to close said aspirator valve when either of a predetermined negative or positive pressure is detected in the fuel tank being filled, thereby permitting the negative pressure in said aspirator line to reach said predetermined value at said pressure sensitive means so as to actuate said pressure sensitive means to close said fuel valve.