Jeep UNIVERSAL CJ-2A - Page 95

F
FUEL SYSTEM
FIG. 113--CARTER CARBURETOR-MODELS CJ-2A, CJ-3A
1-Pump Operating Lever
2-Choke Valve
3-Choke Shaft and Lever
4-Metering Rod Spring
5-Nozzle
6-Nozzle Retaining Plug
7-Metering Rod Disc
8-Needle, Pin, Spring and Seat
9-Float and Lever
10-Low Speed Jet
11-ldle Well Jet
12-Metering Rod Jet ,.nd Gasket
13-Metering Rod
14-Nozzle Passage Plug and Gasket
15-ldle Adjustment Screw
16-Idle Adjustment Screw Spring
17-ldle Port Rivet Plug
18-Throttle Valve
19-Pump Jet
20-Pump Jet Strainer Nut
21-Pump Jet Strainer
22-Intake Ball Check
23-Discharge Disc Check
24-Pump Plunger Spring
25-Pump Plunger and Rod
26-Pump Arm Spring
27-Pump Connecting Link
28-Pump Arm and Collar
8
·9
F-3. Float Circuit
nozzle. If the fuel level is too high, it will cause
trouble in both the low and high speed circuits.
The float bowl acts as a reservoir to hold a constant
supply of fuel. The level of the fuel in the bowl is
controlled by the float and lever assembly, float
bowl cover,
and the need,le valve seat assembly.
The float circuit Fig ... 114, is important. because it
controls the heights of the fuel level in the bowl and
94
FIG. 114-FLOAT CIRCUIT
1-Needle Valve Seat Assembly
2-Float and Lever Assembly
3-Float Bowl
4-Float Bowl Cover
5-Vent
10450
F-4. Low-Speed Circuit
The idle or low speed circuit, Fig. 115, controls the
supply of fuel to the engine for idle speeds and
light load operation up to approximately 20 miles
[32 km.] per hour. It supplies a small amount of
fuel through the entire operating range, gradually
decreasing as speed is increased above 20 miles [32
km.] per hour.
During idle and low speed operation of the engine,
fuel flows
from the float bowl through the idle well
jet and the low speed jet to the point where it
combines with a stream of air entering through
by-pass. The combining of the fuel with the air
atomizes or breaks up the fuel into a vapor.
This mixture of air and fuel continues on through
the economizer until it begins to pass the point
where it is further combined with a stream of air
coming in through the lower air bleed. This mixture
, of fuel and air then flows downward to the idle port
chamber and thence into the engine and also