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FUEL PUMP SPECIFICATIONS
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REPAIR OR REPLACEMENT - TM-5-4210-230-14P-1_888
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 FUEL SYSTEM DESCRIPTION The fuel pumps used on most gasoline type engines are  of  the  mechanical  type  and  are  mounted  on  the  engine, Fig.  1.  The suction side of the pump is connected to the fuel tank and the discharge side is connected to the carburetor by tubing  designed  to  carry  the  fuel.    The  purpose  of  the  pump used on gasoline type engines is to suck fuel from the supply tank and push it into the carburetor float bowl as required by the engine. Electric fuel pumps are also used  to  supply  the  fuel from  the  tank  to  the  engine.    In  most  cases  the  electric  fuel pump is located in the fuel tank, Fig.  2. Fig.  1  Mechanical Fuel Pump (Side Mounted Bowl Type) Fig.  2  In-Tank Mounted Electric Fuel Pump OPERATION Mechanical Fuel Pump In  general  the  pumping  operation  for  all  mechanical pumps  is  accomplished  through  a  pump  rocker  arm  which contacts  a  special  cam  on  the  engine  camshaft.    The  rocker arm   in   turn   actuates   a   diaphragm   in   the   pump,   and   this action, together with the action of inlet and outlet valves in the pump,  causes  gasoline  to  flow  through  the  pump.    Pumping action  is  controlled,  however,  by  fuel  pressure  in  the  pump outlet  line.    When  the  float  needle  valve  in  the  carburetor  is not   seated   and   the   fuel   passage   into   the   carburetor   float chamber is open, gasoline will flow to the carburetor.  When the needle valve is closed and held in place by the pressure of the fuel in the bowl and on the float, the pump will continue to build up pressure until it overcomes the pressure of the pump diaphragm  spring.    This  pressure  results  in  almost  complete stoppage of diaphragm movement until further fuel is needed. Electric Fuel Pump (In-Tank Mounted) The in-tank mounted electric fuel pump is cushioned in  neoprene  to  dampen  vibrations  and  is  supported  by  an adjustable  hanger  assembly,  which  makes  it  adaptable  to  all IH fuel tank depths.  A spring-loaded latch permits easy motor replacement.      Electrical   connections   are   the   sealed   quick- disconnect type, Fig.  2. MAINTENANCE Efficient  operation  of  the  fuel  pump  depends  on  the proper maintenance of the fuel filter. For this reason the filter should be checked from time to time to note any accumulation of dirt, water, or other foreign objects.  The interval for actual cleaning  or  replacing  of  the  filter  element  is  dependent  on engine operating conditions. Engines   which   are   equipped   with   in-tank   mounted electric  fuel  pump  are  either  equipped  with  one  or  two  fuel filters   in   the   system,   depending   upon   the   type   of   engine. Gasoline type engines are equipped with an in-line fuel filter. A  primary  and  secondary  fuel  filter  are  both  used  on  diesel engine applications.  The primary filter is the first filter in the line  from  the  fuel  tank.    The  secondary  fuel  filter  is  usually located on the engine. To clean the wire screen: disc type filter, remove the filter  bowl  and  filter  and  wash  these  parts  in  a  commercial carburetor clean- CTS-2050-F Page 3 PRINTED IN UNITED STATES OF AMERICA

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