ARMY TM 9-2815-259-24 AIR FORCE TO 38G1-125-2 MARINE CORPS 09249A/09246A-24 3-43 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. (2)     Position new fuel filter element (2) on fuel filter base (9) using a slight rocking motion.  Insure that fuel filter element is properly indexed on fuel filter base.   (3)     Position retaining ring (1) on fuel filter base (9) and tighten about 1/3 turn until retaining ring "snaps" into detent.  Do not overtighten retaining ring. (4)     Bleed fuel system, refer to paragraph 3.12.1. 3.12.3.   FUEL TRANSFER SUPPLY PUMP. a.   Test, on Engine. 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 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.