ARMY TM 92815-256-24
AIR FORCE TO 38G1-96-2
MARINE CORPS TM 2815-24/5
Section VIII. FUEL SYSTEM MAINTENANCE
Escaping diesel fuel under pressure can have sufficient force to penetrate the skin, causing serious
injury. Before disconnecting fuel lines, be sure to relieve pressure. Before applying pressure to the
system, be sure all connections are tight and lines, pipes, and hoses are not damaged. Keep hands
and body away from pinholes and nozzles which eject fuel under pressure. Use a piece of cardboard
or wood, rather than hands, to search for suspected leaks.
If any fluid is injected into the skin, it must be surgically removed within a few hours by a doctor
familiar with this type injury or gangrene can result.
3-23. BLEEDING FUEL SYSTEM.
Diesel fuel is flammable and toxic to eyes, skin, and respiratory tract. Skin/eye protection required.
Avoid repeated/prolonged contact. Good general ventilation is normally adequate.
Catch fuel in suitable container.
Any time fuel system has been opened up for service (lines disconnected or filter removed), it will be necessary to bleed
air from system. The fuel system can be bled at one of several locations.
3-23.2. Bleed At Fuel Filter
Loosen air bleed screw (17, FIGURE 3-58) on front of fuel filter.
Operate primer lever of fuel supply pump (22) until fuel flow is free from air bubbles. Tighten bleed screw
securely, continue operating hand primer until pumping action is not felt. Push hand primer inward (toward
block) as far as it will go.
3-23.3. Bleed At Fuel Injection Pump.
Always use two wrenches when loosening or tightening fuel lines at nozzles and/or injection pump to