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). INJECTION PUMP TIMING CHECK Check injection pump timing (Para 4-4). (a) If    injection    pump    timing    is    incorrect,    reset timing. (b) If injection pump timing is correct, go to Step 3 of this Fault. 2-41