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Fig.  12  Vapor Storage Canister With Vacuum Controlled Carburetor Fuel Bowl Vent Valve
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ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 It  is  important  that  canister  hoses  be  connected  to the proper manifold fitting. Canister Control Valve Test Before starting the following test with hand operated vacuum pump (SE-2499), check pump for leakage (Fig.  14) by placing a finger over the vacuum port and pump until full or near  full  scale  is  reached.    Watch  pump  gauge.    If  vacuum drops  rapidly,  pump  is  leaking  and  should  not  be  used  for test.  If a very slow leak is indicated, the pump may be used if the degree of pump leakage is kept in mind. Fig.  14  Check Hand Operated Vacuum Pump SE-2499 for Leakage 1. Test canister fuel bowl vent control valve diaphragm by applying vacuum to the control valve port (smaller top port valve   assembly)   with   hand   operated   vacuum   pump   (SE- 2499).   Observe  vacuum  pump  gauge  (Fig.   15).   If  vacuum drops  rapidly  the  control  valve  diaphragm  is  leaking  and  the canister must be replaced. Fig.  15 Canister Fuel Bowl Vent Control Valve Diaphragm Test 2. The  valve  seat  portion  of  the  fuel  bowl  vent  control valve   can   be   tested   by   applying   vacuum   to   the control valve (same as diaphragm test Fig.  15) and at the same time (with another hand operated pump SE-2499  using  air  pressure  side  of  pump)  apply  air pressure to the valve (Fig. 16) until pressure buildup is felt. If pressure buildup is not felt the valve seat is leaking and the canister must be replaced. 3. Test  purge  control  valve  diaphragm  and  valve  seat by   applying   vacuum   with   hand   operated   vacuum pump    (SE1499)    simultaneously    to    both    vacuum signal port and purge port (see Fig. 17).  If vacuum of  either  pump  drops  rapidly  the  valve  is  faulty  and the canister must be replaced. Fig.  16  Canister Fuel Bowl Vent Control Valve Seat Test Fig.  17  Canister Purge Control Valve Diaphragm and Valve Seat Test CGES-215  Page 12 PRINTED IN UNITED STATES OF AMERICA

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