TM 10-3930-671-24 Be  prepared,  with  a  container,  to  catch  the  fuel  as  it comes out of the open line.  A steady solid stream of fuel indicates    that    the    fuel    pump    is    probably    okay    for continued   use.      A   broken   stream   with   bubbles   and dribbles   or   no   fuel   at   all   indicates   the   fuel   pump   is probably bad or that there are restrictions somewhere in the fuel circuit.  There could also be an air leak in the fuel pickup line on the suction side of  the  pump  causing  the pump to cavitate. If  restrictions  are  suspected  in  the  fuel  circuit,  they  are most likely found to be either plugged fuel filters or trash on the inlet side of the electric fuel pump. BLEEDING THE FUEL SYSTEM Bleeding  is  necessary  on  initial  installation  of  the  fuel injection system after any subsequent removal and if the system should be drained after having run out of fuel. NOTE Electrical    equipment    such    as    starters should  be  shielded  with  non-conductive material  during  the  bleeding  process  to prevent damage from fuel entry.  Also, be certain that all transmissions, gearboxes, hydraulic   control,   etc.,   are   in   a   neutral position  before  attempting  to  crank  the engine.  If a wheel vehicle is involved, be certain   that   the   wheels   are   “chocked” and the parking brake is set. STANADYNE Fuel System 1. Turn the ignition switch to the ’ON position. 2. Loosen the filter outlet connection (A), or the fuel injection  pump  inlet  connection  (B)whichever  is the higher, and allow fuel to flow until free of air. Tighten the connection. NOTE If  connection  (A)  is  inaccessible  due  to the type of filter In use, loosen connection (B). Typical STANADYNE Fuel System Schematic’ 3. Loosen any two injector high-pressure pipe nuts at  the  injector  end.    Set  the  accelerator  to  the fully  open  position  and  with  the  ignition  switch "ON,"  crank  the  engine  until  fuel  free  from  air flows.  Tighten the line nuts. 4. Start the engine. FUEL FILTERS Clean   fuel   is   a   must   in   diesel   operation.      Extreme conditions may require additional filters to provide longer filter  change  periods--when  clean  fuel  is  not  available. Continental  diesels  are  normally  equipped  with  the  filter installed between the fuel injection pump and the transfer pump  outlet-so  the  filter  is  on  the  pressure  side  of  the transfer pump. The period for changing the element  will  largely  depend upon   the   quality   and   condition   of   the   fuel   available. Under    normal    conditions,    the    element    should    be renewed   every   400   hours.      This   period   should   be decreased  if  unavoidable  contamination  of  the  fuel  is experienced. NOTE Electrical    equipment    such    as    staners should  be  shielded  with  non-conduction material     during     filter     replacing     and priming to prevent fuel entry. STANADYNE FUEL FILTER NOTE This fuel filter is not a water separator.  If water   contamination   is   anticipated,   an additional  primary  fuel  filter  and  water separator  should  be  installed  before  the fuel transfer pump. No attempt should be made to clean this type element. It should be replaced at the regularly scheduled periodic maintenance interval or if there is reason to believe that it is   plugged.      To   replace   the   metal   canister   element, simply  release  the  two  spring  clamps  and  pull  the  old element  off  the  filter  bracket.    Lube  the  new  element grommets  with  clean  diesel  fuel  and  push  into  place. Snap  the  spring  clamps  into  position  and  bleed  the  fuel system. F-152