SAE J285_200704

This SAE recommended practice provides standard dimensions for liquid fuel dispenser nozzle spouts and a system for differentiating between nozzles that dispense liquid fuel into vehicles with Spark Ignition (SI) Engines and Compression Ignition (CI) Engines for land vehicles. Current legal definitions only distinguish between “UNLEADED Fuel” and “All Other Types of Fuel.” These definitions are no longer valid. This document establishes a new set of definitions that have practical application to current automobile liquid fuel inlets and liquid fuel dispenser nozzle spouts. When this recommended practice was first released in 1972, its primary purpose was to distinguish between nozzle spouts to be used with UNLEADED gasoline and those currently in use at that time to dispense LEADED gasoline. On or about the year 2000, leaded gasoline was eliminated by law in the global marketplace, thus every liquid fuel now available should be “unleaded.” In addition, the number of UNLEADED liquid fuels intended for use in emission-controlled automobiles with exhaust after-treatment catalytic converter has grown to include blends with oxygenates and bio-fuels. Similarly, the application of diesel engines to automobiles has grown to include new types of bio-fuels. Thus, the main function for the differences between nozzle spout designs has become to distinguish between liquid fuels to be used in vehicles with spark ignition engines from those to be used in vehicles with compression ignition engines. The need for differentiation is due to the damage that can occur to the engine and/or its emission control systems if a vehicle is misfueled. The diameter difference between nozzle spouts establishes a basis on which a vehicle’s fuel filler inlet can be designed to help prevent the introduction of liquid fuel that is not compatible with its engine. The need to differentiate diesel spout diameters will help eliminate fuel spit-back and spills caused when refueling passenger cars and Light Duty Trucks with large diameter/high flow nozzles.