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ENGINE FUEL 6M-4
Fig. 3C-Fuel Level Sight Plug
2. Push hand choke knob in to within 1/8" of instru-
ment panel.
3. Loosen choke cable clamp at carburetor bracket and
adjust cable through the clip until the choke valve
is wide open.
4. Tighten cable clamp at carburetor bracket and check
operation of choke valve to ensure full closed and
wide open positions.
5. Install air cleaner.
Float Adjustment
Ho/fey (Model 4150 Center Inlet & Model 2300)
1. Remove air cleaner then remove the fuel level sight
plugs (Fig. 3c)
2. With parking brake on, and transmission in neutral,
start the engine and allow it to idle.
3. With the car on a level surface, the fuel level should
be on a level with the threads at the bottom of the
sight plug port (plus or minus 1/32 inch).
NOTE:
No float drop adjustment is required
on this carburetor.
4. If necessary to adjust (either or both bowls), loosen
inlet needle lock screw and turn the adjusting nut
clockwise to lower or counter-clockwise to raise
fuel level, then tighten lock screw.
NOTE:
1/6 turn of adjusting nut equals ap-
proximately 1/16" fuel level change.
5. Allow a minute for fuel level to stabilize then re-
check the level at sight plug.
6. Readjust, if necessary, until proper level is obtained,
then install sight plug and air cleaner.
NOTE:
To assure proper secondary float level
setting it is advisable to accelerate primary
throttles slightly and hand operate secondary
throttle.
This assures a stabilized secondary
fuel level.
Additional Adjustments
The following adjustments may be made without re-
moving the carburetor from the engine. For procedure
refer to Section 6M of the Overhaul Manual under the
carburetor being serviced.
Rochester BV
• Float
• Idle Vent
• Choke Rod (Fast Idle)
• Choke Vacuum Break
• Choke Unloader
Rochester 2GV
• Float
• Accelerator Pump
• Idle Vent
• Choke Rod (Fast Idle)
• Choke Vacuum Break
• Choke Unloader
• Secondary Throttle Opening
• Secondary Throttle Lockout
Rochester 4MV
• Float
• Accelerator Pumj)
• Idle Vent
• Air Valve
• Choke Rod
• Choke Vacuum Break
• Choke Unloader
• Air Valve Lockout
• Secondary Opening
• Secondary Lockout
Carter YF
• Float
• Idle Vent
• Choke Rod (Fast Idle)
• Choke Vacuum Break
• Choke Unloader
Holley 4160 and 4150 (Except End Inlet)
• Float
• Air Vent Valve
• Accelerator Pump
• Choke Vacuum Break
• Choke Unloader
Holley 2300 and 4150 (End Inlet)
• Air Vent Valve (except 2300)
• Accelerator Pump
• Choke Vacuum Break
• Choke Unloader
Removal
Flooding, stumble on acceleration and other perform-
mance complaints are, in many instances, caused by the
presence of dirt, water, or other foreign matter in the
carburetor. To aid in diagnosing the cause of the com-
plaint, the carburetor should be carefully removed from
the engine without draining the fuel from the bowl.
The contents of the fuel bowl may then be examined for
contamination as the carburetor is disassembled.
1. Remove air cleaner and gasket.
2. Disconnect fuel and vacuum lines from carburetor.
CHEVROLET CHASSIS SERVICE MANUAL
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