TM 9-2320-361-20 3-29. SECONDARY AND FINAL FUEL FILTERS TESTING AND MAINTENANCE (Contd) g. Fuel Filter Head, Secondary, and Final Fuel Filters Installation 1. Install fuel filter head (2) on engine (1) with three new lockwashers (5) and nuts (6). 2. Install tee (9), three elbows (3), and elbow (8) on fuel filter head (2). 3. Connect three fuel lines (4) and fuel line (7) to elbows (3) and (8). h. Bleeding Air 1. 2. 3. 4. 5. 6. 7. 8. 3-58 Place accessory switch on instrument panel to ON position (TM 9-2320-361-10) to operate in-tank fuel pump. Do not start engine at this time. NOTE Have drainage container ready to catch fuel. Loosen bleeder valve (11). When fuel starts to flow close bleeder valve (11). NOTE Perform step 3 for secondary and final fuel filters with two bleeder valves. Open and close each bleeder valve (11) until fuel is clear of air bubbles. WARNING Fuel pressure is sufficient to penetrate skin. Wear hand protection at all times when removing injector tubes. Failure to do so may result in injury to personnel. Stay clear of moving parts. Failure to do so may result in injury or death to personnel. Loosen injector tube (13) from injector (12). Crank engine (TM 9-2320-361-10) until no air bubbles are observed in fuel. Tighten injector tube (13). Repeat step 4 for remaining injectors (13) in sequence shown. Start engine (TM 9-2320-361-10). With engine running, again open and close bleeder valve (11) until fuel is clear of air bubbles. Tighten bleeder valve (11) and stop engine (TM 9-2320-361-10). Wipe fuel from secondary and final fuel filter housings (10) and injectors (13) with clean rag.