TM 10-3930-669-20 CAUTION Area  around  filter  must  be  very  clean.    Any  contaminants  entering  filter  adapter  will  damage equipment. (2) Using wiping rags, clean area around fuel filter (1). (3) Remove   fuel   filter   (1)   and   preformed packing   (2)   from   fuel   filter   head   (3). Discard fuel filter and preformed packing. b. Installation. (1) Fill fuel filter (1) with fuel. (2) Coat   surface   of   preformed   packing   (2) with a light coat of clean fuel. (3) Install     fuel     filter     (1)     and     preformed packing (2) on fuel filter head (3).  Tighten fuel   filter   one-half   turn   after   preformed packing contacts fuel filter mount. (4) Remove wiping rags from under fuel filter (1). (5) Start engine (TM 10-3930-669-10). NOTE Run engine for five minutes to allow air to escape from fuel system. (6) Shut off engine (TM 10-3930-669-10). NOTE Follow-on Maintenance: • Connect batteries (Para 7-48). • Close   right-hand   engine   access   cover   (TM   10- 3930-669-10). • Remove wheel chocks (TM 10-3930-669-10). END OF TASK 4-23