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Power Enrichment System
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TRUCK GROUP SERVICE MANUAL TM 5-4210-230-14&P-1 GENERAL cavity   vacuum   when   the   throttle   plates   are   opened   to   50 degrees or greater.  At this angle a hole in the throttle shaft and the hole in the throttle body are aligned, permitting flow of clean air from the air cleaner to the power valve cavity, thus reducing cavity vacuum and insuring full fuel enrichment (Figures 12 and 13). Figure 12  Modulator Valve in Open Position Power Valve Open 1.  Clean Air Tube 4.  Hole in Throttle Shaft 2.  Air to Governor Aligned with Hole in 3.  Throttle Plate Throttle Body 5.  Vacuum Cavity 6.  Two-Stage Power Valve Acceleration Pump System The  accelerating  pump  is  located  in  the  bottom  of  the fuel bowl.  The function of the pump is to discharge fuel into the carburetor  upon  acceleration  demand  in  order  to  compensate for  the  inertia  of  the  fuel  metering  system  with  a  temporary, instantaneous  enrichment  of  the  air/fuel  mixture.    The  pump consists   of   a   spring   loaded   diaphragm,   a   normally   closed needle  check  valve  (discharge)  and  a  normally  open  ball  or plastic check valve (inlet).  The pump is actuated by a rotating mechanical   link   mounted   between   the   diaphragm   and   the throttle lever assembly (Figures 14 and 15). As the throttle is opened, a cam mounted to the throttle lever rotates the pump lever, depressing the pump Figure 13  Modulator Valve in Closed Position Power Valve Closed 1.  Clean Air Tube 5.  Vacuum to Power Valve 2.  Air to Governor Diaphragm 3.  Throttle Plate 6.  Vacuum Cavity 4.  Hole in Throttle Shaft Figure 14  Acceleration Pump Fuel Flow (shown with inlet check ball not used on early models). 1.  Discharge Nozzle 4.  Pump Inlet Check Ball 2.  Pump Discharge Weight 5.  Diaphragm 3.  Diaphragm Return Spring   6.  Discharge Passage CGES-125-T  Page 9 PRINTED IN UNITED STATES OF AMERICA

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