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Fig.  7  Dry Type Air Cleaner Filter
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Fig.  12  Vapor Storage Canister With Vacuum Controlled Carburetor Fuel Bowl Vent Valve
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 1. Provide    space    for    gasoline     expansion     due     to temperature rise. 2. Limit  escape  of  gasoline  vapors  to  the  atmosphere by   collecting   and   storing   vapors   generated   while vehicle is parked with engine shut off. 3. Burn   off   stored   gasoline   vapors   when   engine   is operating. Vapor Storage Canister When vehicle is parked and engine shut off, gasoline vapors from the carburetor fuel bowl and the fuel tank will be temporarily stored in the charcoal canister-until the engine is started.    When  the  engine  is  started  the  vapors  are  drawn from the canister into the engine and burned. When a vehicle is parked continuously for more than one  day,  the  odor  of  fuel  vapors  may  be  noticed.    This  is caused  by  fuel  vapors  passing  out  of  the  canister(s)  due  to oversaturation  of  the  charcoal.    Operating  the  engine  a  few minutes will purge the canister(s) of fuel vapors and restore its holding capacity. Two   types   of   vapor   storage   canister   systems   are used in 1980 California vehicles. Fig.  10  Vapor Storage Canisters Used on MediumHeavy Duty Vehicles With Single Tank of 35 Gallon Capacity and Less 1. Two  vapor  storage  canisters  are  used  on  medium- heavy   duty   vehicles   with   single   fuel   tanks   of   35 gallon  capacity  or  less.    One  canister  is  used  for storing  fuel  tank  vapors  only.    The  other  canister  is used for carburetor fuel bowl vapors only.  This vapor storage  canister  and  its  operation  is  shown  in  Fig. 12. 2. Three vapor storage canisters are used on medium- heavy duty vehicles with single fuel tank greater than 35  gallon  capacity  and  all  multi-tank  vehicles.    As shown   in   Figure   10,   the   fuel   tank   vapor   storage canisters   consist   of   one   canister   with   a   vacuum controlled   purge   valve   and   one   two-port   canister which   is   connected   to   the   bottom   of   the   vacuum controlled purge canister.  The two-port canister adds vapor storage capacity for large fuel tank(s) systems. The    operation    of    the    vacuum    controlled    purge canister is shown in Figure 13. The   function   of   the   third   vapor   storage   canister (shown  in  Fig.    11)  is  to  store  carburetor  fuel  bowl vapors only.  The operation of this canister is shown in Fig.  12. Fig.  11  Vapor Storage Canisters Used on Medium-Heavy Duty Vehicles With Single Fuel Tank Greater Than 35 Gallon Capacity and All Multi-Tank Installations Canister Operation Test Disconnect  control  vacuum  and  purge  hoses  from canister(s).      With   engine   running   at   high   idle   speed   and normal operating temperature, a vacuum pull should be felt at each hose end.  If no vacuum is felt, reconnect hoses to the proper   port   on   the   canister(s)   and   disconnect   at   vacuum source on engine.  Inspect for obstruction in hoses and hose connecting fittings.  Also inspect hoses for cracks, damage or deterioration and replace if necessary. . CGES-215  Page 10 PRINTED IN UNITED STATES OF AMERICA

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