TM 9-2815-225-34&P 3-62.  FUEL PUMP MAIN HOUSING REPAIR (Contd) LOCATION/ITEM ACTION REMARKS d.  Assembly (Contd) 39. New gasket washer (7), a.  Install on air fuel control piston Round end of retainer washer (8) retainer washer (8), new insert (6). must be against bellows (9) when bellows (9), AFC piston (10), assembled.  If bellows has a part and piston spacer (11) number, it must face toward piston (10). b.  Secure with nut (5). Ensure all parts are aligned.  Do not twist bellows (9).  Torque nut (5) to 30-40 lb-ft (41-54 Nm). 40. Throttle plunger (13) Install on air fuel control piston Lubricate O-ring (30).  Threaded and new O-ring (30) insert (6). end of plunger (13) should be flush with outer edge of piston insert (6). 41. Jamnut (12) Turn on throttle plunger (13) until finger-tight. 42. Barrel spring (21), barrel a.  Install barrel spring (21) on (20), and new O-rings housing (38). (17), (18), and (19) b.  Apply a light coat of lubricating oil to O-rings (17), (18), and (19), and install on barrel (20). c.  Press barrel (20) into housing (38). d.  Secure with retaining ring (16). NOTE   For M915A1/Big Cam III engine fuel pumps, proceed to step 43 after completing step 42d.   For M915/Big Cam I engine fuel pumps, perform steps 42e through 42o.  Do not perform steps 43 or 44. e.  Lubricate barrel O-rings (17), (18), and (19), and install in grooves in barrel (20).  Press barrel into housing (38) and secure with retaining ring (16). 3-438