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 lines 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. 2-11