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DESCRIPTION - TM-5-4210-230-14P-1_887
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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PRESSURE   CHECKING   DIESEL   ENGINE   FUEL   SYSTEM (General)
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 FUEL SYSTEM ing  solvent.    Blow  dry  with  compressed  air.    In  some  cases where the paper filter -s used, it is advisable to simply replace the  filter.    This  is  particularly  true  where  fuel  additives  are used.  Such additives can become trapped in filters, and their accumulation   may   cause   a   restriction   in   flow.      Restricted filters are usually slippery to the touch. When   reinstalling   the   fuel   filter   and   bowl   always make  sure  the  gasket  and  spring  are  in  place  and  that  the retainer  screw  is  tight  enough  to  prevent  leakage.    A  leak  at the  gasket  will  cause  erratic  action  of  the  pump  and  thus retard fuel delivery to the carburetor. REPAIR OR REPLACEMENT If  it  has  been  determined  that  fuel  system  troubles are  being  caused  by  a  faulty  fuel  pump,  then  the  pump  can either  be  repaired  or  replaced.    Instructions  on  the  different types of fuel pumps are covered in subsequent paragraphs. If  fuel  trouble  is  encountered  on  any  chassis  having an  electric  fuel  pump,  Fig.    2,  and  the  pump  is  suspected, check  the  pump  as  follows:  Disconnect  the  fuel  line  at  the carburetor or transfer pump and turn on the ignition switch.  If ample fuel flows, you do not have pump trouble.  If the pump races but fuel does not flow in sufficient volume, the cause is an air leak in the suction portion of the fuel system (no fuel). If  fuel  does  not  flow  at  all,  inspect  the  fuel  lines  or  filters  for restrictions or check the electrical connections for a shorted or open  circuit.    If  all  is  in  order  and  the  pump  still  does  not operate, remove the pump and replace. INSTALLATION Mechanical Fuel Pump Be  sure  to  use  a  new  mounting  gasket  between  the mechanical  fuel  pump  mounting  flange  and  the  pad  on  the crankcase  when  mounting  the  pump  on  the  engine.    Tighten the capscrews securely. Connect the fuel lines, first making sure that there is no dirt on the fittings which might be drawn into the system. If  the  carburetor  has  not  been  removed,  there  will usually be sufficient fuel in it to run the engine long enough to fill the fuel pump filter bowl.  If there is an air leak between the filter  bowl  and  gasket,  the  pump  cannot  draw  fuel  into  the bowl.    To  remedy  this,  install  a  new  gasket  and  see  that  the bowl seats squarely.  Tighten the retainer screw securely with the fingers only. If  the  fuel  pump  bowl  still  does  not  fill,  the  trouble may be due to an air-bound condition.  In this case, the bowl should be loosened slightly so that the air can escape, and by blowing in the gasoline tank filler neck, fuel will be forced into the   pump.      Then   tighten   the   bowl   securely   and   start   the engine. Electrical Fuel Pump (In-Tank Mounted) (Gasoline Engines) Connect the fuel lines, first making sure that there is no dirt on the fittings which might be drawn into the system. After  the  pump  is  installed  and  fuel  and  electrical connections  are  made,  turn  on  the  ignition  switch.    If  ample fuel  flows,  there  is  no  trouble  with  the  pump.    If  the  pump races  but  there  is  no  fuel  flow,  there  is  an  air  leak  in  the suction portion of the fuel system or no fuel in the tank.  If no fuel flows at all, inspect the fuel lines or filters for restrictions or check electrical connections for open or shorted circuits. (Diesel Engines) For the most part the installation instructions for the electrical  fuel  pump  used  on  diesel  engines  is  the  same  as used on gasoline engines, except that air can be introduced to the fuel system even on the output side of the pump, since the transfer   pump   could   suck   air   if   a   filter   or   fuel   line   were restricted. Fig.  3  Cutaway View of a Fuel Tank with an Electric In-Tank Mounted Fuel Pump PRIMING DIESEL ENGINE FUEL SYSTEM (General) Most   vehicles   are   now   equipped   with   an   electric primer switch which is located on the instrument panel and is used to purge air from the fuel system. CTS-2050-F Page 4 PRINTED IN UNITED STATES OF AMERICA

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