TM 9-2320-209-20-3-1 c. Removal of Secondary and Final Fuel Filter Assemblies. WARNING To prevent fire or explosion, smoking, flame, sparks, and glowing or hot objects are not allowed near truck during maintenance of fuel system components. FRAME 1 1. 2. 3. 4. 5. 6. 7. Place container under two drain cocks (1) . Unscrew (open) both drain cocks . Screw in drain cock when all fuel stops draining. NOTE Tag fuel lines before taking them off so they will be put back in same place. Using 5/8-inch wrench, unscrew three coupling nuts ( 2). Using 11/16-inch wrench, unscrew coupling nut ( 3). Take off fuel lines (4, 5, 6, and 7) . Using 9/16-inch wrench, unscrew and take off three nuts and lockwashers ( 8). Take off secondary and final fuel filter assemblies (9) . Take out container and put fuel in approved disposal area. END OF TASK 4-57