Fuel Filters

Figure 1-18.-Catalytic converter. NOTE: The cetane number is a measure of the ability of a diesel fuel to provide fast spontaneous combustion with short ignition delay. A knock in a diesel engine is caused by the fuel igniting too slowly. Jet Fuel You may be deployed to some sites at which diesel fuel is not available and JET FUEL has to be used. The three major types of jet fuel used by the military are JP-4, JET-A1, and JP-5. DO NOT USE JP-4 IN ANY DIESEL ENGINE. The maintenance supervisor approves the use of JET-A1 and JP-5 and directs the amount of engine oil that must be added to the jet fuel. This must be done to improve the lubricating qualities that prevent the injector pump and injectors from seizing. FUEL FILTERS Fuel filters trap foreign material that may be present in the fuel and prevent it from entering the carburetor or sensitive fuel injection components. Gasoline Fuel Filter On a gasoline engine system there is at least one fuel filter used in the fuel system and it can be located in any accessible place along the fuel delivery line. Filters also can be located inside fuel tanks, carburetors, and fuel pumps. 1-15 rrm 1 nw