ARMY TM 9-6115-670-14&P 4-71 4.30.  FUEL FILTER ASSEMBLY. This task covers: a.  Service b.  Replace INITIAL SETUP Tools General Mechanic's Tool Kit (Item 1, Appendix B) Gloves, Chemical and Oil Protective   (Item 34, Appendix B) Equipment Conditions MASTER ON-OFF switch on APU control unit set to OFF. Engine stopped and allowed to cool completely. Materials/Parts Fuel Filter An approved solvent (Item 9, Appendix F) SERVICE a.  Clean fuel filter element. (1) Remove fuel filter element (perform steps b (1) through b (3). (2) Rinse the inside of the filter cup with an approved solvent. (3) Rinse the filter element with an approved solvent. (4) Install fuel filter element (perform steps b (5) through b (9)). b.  Replace fuel filter element. (1) Remove radiator support bracket (perform Para 4.18., REMOVE, step d). (2) Close fuel filter valve (1, Figure 4-17) (up-down position). WARNING Ensure that NO IGNITION SOURCE is within 50 feet of the 10 kW APU. The fuel in this APU is highly flammable. Do not smoke. Do not splash fuel on hot components.   Failure to heed this warning could result in serious injury to personnel or DEATH. WARNING Avoid  fuel  contact  with  skin.  Wear  protective  gloves, goggles, apron and mask, while disconnecting fuel lines. Do not splash fuel on hot components.  Failure to heed this warning could result in serious injury to personnel or DEATH. NOTE Have suitable container available to catch fuel spill.