Power System - Chevrolet Light Duty Truck 1973 Service Manual

6 M - 1 4 ENGINE FUEL
M A IN
D ISC H A R G E
N O Z Z L E
BOOST V E N T U R I
M A IN V E N T U R I
T H R O T T L E
V A L V E
the choke valve can be partially opened manually to
allow increased air flow through the carburetor. This is
accomplished by depressing the accelerator pedal to the
floor. The unloader projection on the throttle lever
MAIN WE LL AIR BLEED
LOWER ID LE A IR BLEED
POWER ENRICHMENT SYSTEM
Fig. 18- Power System
POWER PISTON
D R IV E RO D
M E T E R IN G
ROD
POWER
PISTON
SPRING
M A IN M E T E R IN G
JET
POWER PIS TO N
A C T U A T IN G L IN K A G E
POWER PISTON V A C U U M
contacts the edge of the fast idle cam and, in turn,
partially opens the choke valve. The extra air leans out
the fuel mixture enough so the engine will start.
LIGHT DUTY TRUCK SERVICE MANUAL