TM   55-2840-241-23 fer the tube fitting from the removed pump to the new pump. Use new performed packings Iubricated  with  oil  (item8,  table  2-2).  Tighten to  75-100  in.  lb.  Tighten  fittings  in  the  before- filter,  after-filter,  an  seal  drain  ports  to  55-80 in. lb. (2)  Lubricate  new  preformed  packing  (33, figure  5-3  with  oil  (item  7  or  8,   table 2-2) and install on the pump drive. (3)  Coat  fuel  pump  drives  lines  with lubricating  oil  (item  7,  table  2-2). (4)  Install  the  pump  with  new  gasket  (32) on the mounting pads studs. cover on the rear of the pump. Replace the ele- ment  as  follows: When there is evidence that fuel filter  bypassing  has  occured,  the fuel filter in the gas produced fuel control must also be cleaned or replaced.  Contamination  will  be evident due to the fuel pump filter being by-passed (Refer to para- graph  5-12j.) a.  Place  a  container  under  the  pump  assemb- ly as some fuel spillage is likely. Remove the two screws (1, figure 5-4) and washers (2) retaining  the  cover  (4)  to  the  housing. (5) Secure the pump with three washers (30\  and  self-locking  nuts  (29).  lighten  the b. Remove the cover and element (6). Discard nuts to 70-85 in. lb. preformed packings (5,7) and the contaminated filter element. If the element is a tight fit, remove (6)  Install  fuel  tubes  (3  and  4,  figure  5-2) between the fuel pump and control.Tighten by pulling straight out. Twisting may cause the the tube coupling nuts to 150-200 in. lb. element end cap to tear off. . - (7) Connect the fuel supply hose at the 200  in.  lb. pump  inlet  (23).  Tighten  coupling  nut  to  150- vent  (item  3,  table  2-2)  or  with  a  cl-soaked cloth. (8) Connect the before-filter, after-filter, (7) is in place then install the element (6) in and seal dram (25, 26 and 27) hoses. Tighten coupling nuts to 80-120 in. lb.                           preformed packing (5). Tighten cover screws (9)  Bleed  fuel  system.  (Refer  to  paragraph (1) to 95-105 in. lb. 5-7.) NOTE NOTE If  (on  the  first  start  after  the  fuel pump has been changed) either a  false within forty-five (45) seconds, then return the gas producer lever to fuel cut-off and motor the engine for ten (10) seconds. c.  Testing.  Following  installation  of  the  fuel pump, test the engine as outlined in Chapter 5-10.   Fuel   Filter. The fueI/air discharge is irritating and highly flammable. Mechanics must  take  suitable  measures  to protect their eyes and prevent fire. Lockwire is not required if filter cover screws are retained by self locking inserts. e. Puree as follows: The fueI/air discharge is irritating and highly flammable. Mechanics must  take  suitable  measures  to protect their eyes and prevent fire. protect their eyes and prevent fire. plug (figure 5-4, item 3.) (1) Remove the safety wire from the upper bleed port plug (figure 5-4, item 3.) (2) Provide a shop rag to deflect the fuel spray. (3) Turn on the aircraft boost pump. The fuel filter is a 5-micron nominal, 15 micron  absolute,  paper  element  located  inside fuel is emitted and then retighten to 34-45 in. the fuel pump. It is retained by a flanged Ibs. (5) Turn off the fuel pump. start occurs or a start is not completed 5-4   Change  23 d.  Be sure the element preformed packing the housing. Install the cover with new (1) If a new pump is to be installed, trans- fitting in the inlet discharge and bypass ports (4)  Loosen the upperdrain port plug (6) (ap- proximately 1/2 turn) until a solid stream of c.  Clean  the  filter  cover  with  a  ray  of  sol-