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). 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. 2-55