Specialty fuel dispensing nozzle

In a fuel dispensing nozzle for dispensing specialty fuel from a storage tank to a vehicle fill pipe and fuel tank, the dispensing nozzle having a body and a spout insertable into a neck of the fuel tank;

• said spout having an air port at a distal end thereof;
• a fuel flow path for dispensing fuel from the storage tank to the vehicle tank;
• a poppet valve in said fuel flow path, said poppet valve movable between a closed position in which fuel cannot flow through the flow path and an open position in which fuel can flow through the flow path;
• a venturi including a venturi port in communication with said fuel flow path, and a vent tube extending from said venturi port to said air port, said tube having an opening in communication with said air port, said venturi creating a vacuum which pulls air through said vent tube when fuel flows through said flow path;
• automatic shut off means for closing said valve, said automatic shut off means being responsive to the lack of flow of air through said vent tube;
• the improvement comprising a sensor in said nozzle for detecting the presence of a magnetic force at said vehicle fill pipe, said sensor being operable to close said vent tube to effect a prevention in the dispensing of fuel to vehicles which cannot accept the dispensed type fuel.