ARMY TM 9-2815-260-24 AIR FORCE TO 38G1-126-2 MARINE CORPS TM 09244A/09245A-24 3-42 3.12.2.   FUEL FILTER. a.   Remove Fuel Filter Element. CAUTION Dirt in the fuel system can damage components or cause poor engine performance.  Always thoroughly clean the area around connection before disconnecting.  Always cover all openings after disconnecting.  Failure to comply can cause damage to components or poor engine performance. (1) Thoroughly clean outside surface of the fuel filter and surrounding area. __________ WARNING Diesel and JP fuels are flammable and toxic to eyes, skin, and respiratory tract.  Skin and eye protection required.  Avoid repeated/prolonged contact.   Provide adequate ventilation.  Failure to comply could result in serious injury or death. NOTE Catch fuel in suitable container. Dispose of fuel in accordance with local ordinances. (2) Loosen drain plug (3, Figure 3-15) and allow water and fuel to drain into suitable container. NOTE Lift up on retaining ring while rotating to ease removal. (3) Firmly grasp retaining ring (1) and rotate retaining ring counterclockwise 1/4 turn.  Remove retaining ring and fuel filter element (2). b.   Service. (1) Remove drain plug (3, Figure 3-15) and O-ring seal (4).  Discard fuel filter element and O-ring seal in a safe place in accordance with local regulations. (2) Inspect fuel filter base (9) for cleanliness.  Clean as required. (3) Thoroughly inspect seal ring (5) for cracks and other damage.  Replace as needed. c.   Installation (1) Position O-ring seal (4, Figure 3-15) on drain plug (3) and install drain plug (3) on new fuel filter element (2). NOTE Fuel filter element must be indexed properly and key on fuel filter element must be oriented in slot of fuel filter base for correct installation.