Figure 1-18.-Catalytic converter.NOTE: The cetane number is a measure of theability of a diesel fuel to provide fast spontaneouscombustion with short ignition delay. A knock in a dieselengine is caused by the fuel igniting too slowly.Jet FuelYou may be deployed to some sites at which dieselfuel is not available and JET FUEL has to be used. Thethree major types of jet fuel used by the military are JP-4,JET-A1, and JP-5. DO NOT USE JP-4 IN ANYDIESEL ENGINE. The maintenance supervisorapproves the use of JET-A1 and JP-5 and directs theamount of engine oil that must be added to the jet fuel.This must be done to improve the lubricating qualitiesthat prevent the injector pump and injectors fromseizing.FUEL FILTERSFuel filters trap foreign material that may be presentin the fuel and prevent it from entering the carburetor orsensitive fuel injection components.Gasoline Fuel FilterOn a gasoline engine system there is at least one fuelfilter used in the fuel system and it can be located in anyaccessible place along the fuel delivery line. Filters alsocan be located inside fuel tanks, carburetors, and fuelpumps.1-15rrm 1 nw
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