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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fuel Tank Cap Relief Valve Test
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 Fig.  18  Method of Pressurizing Vapor Vent System to Check for Leakage Pressure    test    fuel    tank    vapor    vent    system    by disconnecting  the  hose  on  canister  leading  to  fuel  tank  and connect water manometer (SE-2217 or equivalent) and the air pressure  side  of  hand  operated  vacuum  pump  (SE-2499)  as shown in Figure 18. Place sufficient water in manometer to allow 356mm (14") differential in height.  Pump the hand operated air pump until  a  pressure  of  356mm  (14")  of  water  is  applied  to  the system  (indicated  on  the  manometer).    Pinch  or  clamp  hose between   tee   and   air   pump   to   keep   system   pressurized. Observe manometer.  If pressure drops more than 51mm (2") of water in five (5) minutes, an excessive leak is indicated. On  a  warm  day  it  is  possible  to  observe  a  pressure rise due to evaporation of fuel.  This indicates that system is tight. If excessive leakage is indicated, first check fuel tank cap   for   a   loose   fit   on   tank   filler   neck   or   a   damaged   cap gasket.  If either of these conditions are found, replace cap.  If cap-to-filler  neck  fit  and  cap  gasket  are  satisfactory,  cover relief valve opening in cap (small hole in portion of cap which enters filler neck) securely with tape.  Reinstall cap and again pressurize   system   and   check   for   leakage.      If   excessive leakage   persists,   check   all   connections   in   fuel   supply   and vapor  vent  system  with  soap  suds  solution  to  locate  leaks. Inspect  for  cracked  or  damaged  fuel  supply  or  vapor  vent tubes or connecting hoses.  If no leaks are found and system holds   pressure   with   valve   opening   uncovered,   it   can   be assumed that relief valve in cap is faulty.  Replace cap. When  pressure  testing  system  following  installation of a new fuel tank, it will be necessary to disconnect and plug fuel  system  line  at  fuel  pump  to  prevent  air  leakage  through fuel pump and carburetor. Air Cleaner Charcoal Rings When  engine  is  shut-off,  gasoline  vapors  released through   the   carburetor   throats   are   temporarily   trapped   in charcoal rings located in the bottom of the air cleaner.  When the engine is started the vapors are drawn from the charcoal rings  into  the  engine  and  burned.    Damaged  charcoal  rings should be replaced and installed with a silicone type adhesive. Fuel Tank Cap Fuel  tank  caps  are  nonvented  to  prevent  passing  of gasoline vapors directly into the atmosphere. Fig.  19  Fuel Tank Cap Relief Valve Operation CGES-215  Page 13 PRINTED IN UNITED STATES OF AMERICA

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