TM 10-3930-669-34 • 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. 2-39