TM 10-3930-669-34 b. Adjustment. 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). · Fuel  and  oil  are  slippery  and  can cause falls.  To avoid injury, wipe up spilled fuel or oil with rags. NOTE Air must be bled from system prior to adjusting injection pump. (1) Loosen plug (9) slightly. (2) While holding a container under plug (9), operate high  pressure  hand  feed  pump  until  fuel  flows past plug (9). (3) Tighten plug (9). (4) Actuate   high   pressure   hand   feed   pump   and observe fuel flow from adapter (19). 4-11