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Figure 3  Model 4150G Carburetor with Centrifugal-Vacuum Type Governor
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Main Metering System
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 GENERAL Figure 5  Model 4150EG Carburetor with Electronic Vacuum Modulating Type Governor 1.  Choke Valve 3.  Secondary Control Valve Assembly 2.  Governor Solenoid Assembly 4.  Control Valve Air Cleaner Figure 6 Typical Fuel Inlet System 1. Needle and Seat 5. Float Spring Assembly 6. Float and Lever 2.    Filter Screen Assembly 3.   Accelerating Pump 7. Fuel Bowl Operating Lever 4.   Accelerating Pump Cover Lever Idle System Primary Side.  The 4150 series carburetors utilize two identical idle  systems,  one  for  each  primary  bore.    At  idle,  normal  air pressure in the primary float chamber causes the  fuel  to  flow  through  the  idle  system  to  the  greatly  reduced pressure area below the throttle plate.  Fuel flows from the float chamber through the main jet into the small horizontal passage that leads to a vertical passage. Fuel  flows  up  the  idle  well  passage  past  the  idle  feed restriction.    The  fuel  then  is  mixed  with  incoming  air  from  the idle  air  bleed.    This  fuel  and  air  mixture  flows  down  a  vertical passage to the idle transfer passage and is discharged into the throttle bore below the throttle plate.  (Fig.  7) Secondary Side.  Because of driving habits, some drivers would use  the  secondary  side  very  little.    If  the  secondary  system remains inoperative over long periods the system may become blocked   with   gum   and   carbon   formations.      To   prevent   this condition, an idle system is incorporated on the secondary side. Fuel   flows   from   the   secondary   fuel   bowl   through   the main  jet,  up  the  idle  well  and  through  the  idle  feed  restriction. Then  it  crosses  a  horizontal  passage  and  blends  with  idle  air from  the  idle  air  bleed.    This  fuel-air  mixture  flows  down  a vertical passage to the idle adjusting needle. Part of this mixture flows into the idle discharge passage and part into the idle transfer passage.  The fuel-air is CGES-125-T  Page 6 PRINTED IN UNITED STATES OF AMERICA

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