ADJUSTMENTS
FUEL BOWL VENT VALVE
NOTE: mechanical fuel bowl vent valve should be open to carbon canister when engine is off and closed when engine is running. Make adjustment with carburetor on the vehicle
- Start engine and warm up to operating temperature
- Allow engine to idle at curb idle speed
NOTE: If equipped with solenoid throttle positioner, solenoid must be in retracted (de-energized) position
- Adjust vent valve so adjustment screw just touches drive tab on pump lever
- Turn adjusting screw one full turn clockwise
- Turn engine off
- Observe that vent operating linkage pushes down on vent valve stem
FLOAT LEVEL ADJUSTMENT
- Fabricate tool as shown in image
- Adjust fabricated gauge to specified height
- Remove air horn assembly from carburetor
- Insert gauge into outboard holes in air horn
- Check clearance and alignment of floats to gauge
NOTE: Both floats should just touch gauge
- Align floats, if necessary, by gently twisting
NOTE: On police models, it is necessary to set each float independently
CAUTION: Use fabricated bending tool only when bending tab
AUXILIARY FUEL INLET VALVE ADJUSTMENT
- Install special float level gauge as outlined in float level adjustment procedure
- Turn air horn assembly upside-down
- Measure clearance between auxiliary needle tab on rear of float arm and tip of needle shaft
- If adjustment is needed, use special bending tool and bend auxiliary fuel valve tab
FUEL INLET NEEDLE DROP LIMITED ADJUSTMENT
NOTE: Police applications, with independent floats, are not equipped with this feature. If needle drop limiter is not adjusted properly, engine stalling, fuel starvation, and engine stumble on stops and turns can result
- After completing float level adjustment, remove float hinge pin, float assembly and inlet needle
- Reinstall inlet needle drop limiter and hinge pin
NOTE: Foot of limiter must be behind tang on vacuum piston limiter lever
- Rotate vacuum piston limiter lever until new scribe marks made during disassembly line up
- Hold limiter and shaft assembly in place with tape
- Turn air horn assembly right side up
- Measure clearance between needle drop limiter tab and fuel inlet seat (feeler gauge). Clearance should be .005"
- If adjustment is needed, loosen tape and rotate vacuum piston limiter lever AWAY from needle drop limiter
- Bend long "foot" on needle drop limiter
- Rotate vacuum piston limiter lever back to original taped position and recheck clearance
- Remove hinge pin and needle drop limiter
- Reinstall inlet needle, float assembly, and needle drop limiter
NOTE: Be sure that foot off needle drop limiter is behind tab on vacuum piston limiter lever
