TM 10-3930-669-34 WARNING • Fuel is very flammable and can explode easily.  To avoid serious injury or death, keep fuel away from open fire and keep fire extinguisher within easy reach when working with fuel.  Do not  work  on  fuel  system  when  engine  is  hot.    Fuel  can  be  ignited  by  hot  engine.    When working with fuel, post signs that read NO SMOKING WITHIN 50 FEET (15 m). • Pressure  test  procedure  results  in  fuel  under  high  pressure.    Be  sure  that  pressure  test gauge is connected properly and use safety shield during test.  Failure to do so may result in injury to personnel. INJECTION PUMP PRESSURE TEST (1) Remove cab (TM 10-3930-669-20). (2) Disconnect throttle cable (TM 10-3930-669-20). (3) Position control lever to maximum position. (4) Remove pump cover (Para 4-5). (5) Tag  and  disconnect  injection  pump  injector  line one at a time. (6) Connect injection pump tester gauge to injection pump port fitting. (7) Install pressure plug in No.  1 injector line. (8) Open bleeder valve on back of test gauge. (9) With   aid   of   an   assistant   using   retainer,   turn crankshaft clockwise  until  pump  element  to  be  tested  is at the bottom of its stroke. (10) Using  pump  lever,  lift  plunger  to  bleed  air  from pressure gauge.  Close bleeder valve. (11) Hold shutoff solenoid in open position and pump lever until pressure gauge reads 2,175 psi (14,997 kPa). (12) Observe pressure gauge for 60 seconds. (a) If  145  psi  (1,000  kPa)  or  higher  is not  measured,  perform  Steps  (14) and (15) below and replace injection pump (Para 4-5). (b) If  145  psi  (1,000  kPa)  or  higher  is measured, go to step (13) below. (13) Hold shutoff solenoid in open position and pump lever until pressure gauge reads 5,075 psi (34,992 kPa). (a) If 5,075 psi (34,992 kPa) cannot be measured,  perform  Steps  (14)  and (15)    below    and    replace    injection pump (Para 4-5). (b) If   5,075   psi   (34,992   kPa)   can   be measured, repeat steps (5) through (13) above for remaining  elements. If    all    elements    are    OK,    perform Steps  (14)  and  (15)  below  and  go to Step 2 of this Fault, (14) Remove injection pump tester gauge from pump port fitting. (15) Install pump cover. 2-53