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CHART NO.  25 ENGINE SURGES AT GOVERNED SPEED
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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ADDENDUM NO.  2 COMPRESSION AND CYLINDER LEAKAGE TESTS
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 ADENDUM NO.  1 FUEL SYSTEM VAPOR LOCK Vapor   lock   occurs   when   fuel   system   components become  sufficiently  heated  to  cause  fuel  to  vaporize  within fuel  lines,  filter,  or  fuel  pump  at  a  rate  which  prevents  liquid fuel  from  reaching  the  carburetor.    Vapor  lock  is  generally associated  with  hot  ambient  conditions  but  can  still  occur  in cooler   climates   when   vehicle   or   engine   is   operated   under heavy  load.    Vapor  lock  conditions  are  aggravated  at  higher altitudes. To  trouble  shoot  a  suspected  vapor  lock  condition, proceed as follows. 1.  Do vapor lock conditions prevail? Look for hot fuel system components.  Does engine run OK when cool? 2.  Remove carburetor air cleaner and pump throttle by hand. Observe  accelerator  pump  discharge.    Absence  of  pump shot  or  weak  discharge  may  indicate  vapor  lock.    Check for   presence   of   fuel   in   tank.      Check   for   fuel   system obstructions. 3.  Check fuel pump discharge pressure by removing fuel line from carburetor inlet, connect fuel pressure tester to open end of fuel line (*) and crank engine.  A vapor locked fuel pump will produce some pressure, although not necessarily  specified  pressure.  Observed  pump  pressure as low as 1 to 2 psig indicates that the pump is probably OK  but  should  be  checked  again  when  engine  is  running normally. (*) NOTE: For this test, do not "tee" pressure tester     into     fuel     line     between     fuel     pump     and carburetor.    No  pump  discharge  pressure  would  be observed because fuel vapor would be vented to the carburetor bowl through the open needle valve. If fuel pump has measurable discharge pressure but does not pump liquid fuel when system is very hot, vapor lock is a likely cause. 4.    If  vapor  lock  is  suspected  as  the  cause  for  rough  engine operation during cruise or acceleration it may be checked as follows. "Tee" fuel pressure tester fitting into fuel line between fuel   pump   and   carburetor.      Place   test   gauge   in vehicle  within  view  of  driver  or  passenger.    Connect to  fitting  with  flexible  fuel  line.    Operate  vehicle  on highway until rough operation occurs. Note    fuel    pressure    during    rough    operation.        If pressure drops to zero, vapor lock may be the cause. (Check fuel lines and filter for obstructions.) Remove fuel pressure tester and fitting from fuel line and   allow   fuel   system   components   to   cool;   then check to see that normal engine operation has been restored.    If  engine  does  not  run,  refer  to  Trouble Shooting Charts 4 or 5. CGES-215 - Page 45 PRINTED IN UNITED STATES OF AMERICA

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