Operate the hand primer until most ofthe air bubbles are expelled fromthe glass bowl on the pump.
Unscrew the hand primer knurled knob on the fuel pump, and loosen until it can be pulled up by hand. To bleed the fuel system on "T" and "A" engines, loosen the bleed plug (A, Fig. Push the hand primer back (toward engine) as far as possible and tighten filter bleed plug. To bleed the fuel system on "0" engines, loosen the bleed plugon the fuel filterbase (A,Fig.6) and operate the hand primer on the fuel pump until most of the air bubbles are expelled from the filter. Whenever the fuel system has been opened up for service (linesdisconnected or filtersremoved), itwillbe necessary to bleed the air from system. Serious infection or reaction can develop if proper medical treatment is not administered immediately. If injured by escaping fuel, see a doctor at once. To do so may cause seizure of pump parts. IMPORTANT: Never steam clean or pour cold water on an injection pump while the pump is running or while it is warm. 4270D Removal FUEL INJECTION PUMP Fuel and Air Repair Clean the injection pump, pipes, and area around the pump with cleaning solvent or a steam cleaner. Use a piece of cardboard or wood, rather than hands, to search for suspected leaks. Fuel escaping from a very small hole can be almost invisible. Before applying pressure to the system, be sure all connections are tight and that lines, pipes and hoses are not damaged. Before disconnecting lines be sure to relieve all pressure. CAUTION: Escaping diesel fuel under pressure can have sufficient force to penetrate the skin, causing serious personal injury. 1 Diesel Fuel System BLEEDING FUEL SYSTEM.
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