Jeep UNIVERSAL CJ-2A - Fuel System

'Jeep' UNIVERSAL and 'Jeep' DISPATCHER
F
FUEL SYSTEM
Contents
SUBJECT
PAR.
Acceleration Flat Spot... . .......... F-27
Accelerator Linkage. . . . . .... F -49
Air Cleaner . . . . . . . . . . . . ....... F -48
CARBURETOR ..................... F-2, F-14
Accelerating Pump Circuit ..... F-6, F-12, F-23
Assembly .............................. F-26
Choke Circuit ................. F-7, F-13, F-21
Disassembly..... . . . . . . . . .. F-25
Fast-Idle Adjustment ................... F -22
Float Adjustment...... . ........... F-16
Float Circuit........... . .. F-3, F-9, F-15
High-Speed Circuit. . . . . . . . . . . F -5, F -11, F -19
Idle Adjustment....... . ........... F-18
Low-Speed Circuit ............. F-4, F-10, F-17
F-1. GENERAL
The fuel system consists of the fuel tank, fuel lines,
fuel pump, carburetor and air cleaner.
The most important attention necessary to the fuel
system is to keep it clean and free from water.
It should be periodically inspected for leaks.
CAUTION-Whenever a vehicle is to be stored for
an extended period, the fuel system should be com-
pletely drained, the engine started and allowed to
run until the carburetor is emptied. This will avoid
oxidization of the fuel, resulting in the formation of
gum in the units of the fuel system. Gum formation
is similar to hard varnish and may cause tlie fuel
pump valves or the carburetor float valve to be-
come stuck or the filter screen blocked. Acetone
or commercial fuel system cleaners will dissolve
gum formation. In extreme cases it will be necessary
to dissassemble and clean the fuel system. In most
cases, however, a good commercial fuel system sol-
vent used in accordance with the manufacturer's
instructions or one pint [0,6 ltr.] of acetone placed
in the fuel tank with about one gallon [4,5 ltr.]
of gasoline will dissolve any deposits as it passes
through the system with the gasoline.
SUBJECT
PAR.
Metering Rod Adjustment ............... F-20
Servicing and Adjusting .................. F -8
Steep-Grade Carburetor Kit .............. F-28
FUEL PUMP ...................... F -29, F -32
Assembly .................... F-31, F-34, F-41
Disassembly ................. F -30, F -33, F -40
Testing ........................... F-35, F-43
Fuel Tank Cap.......... . .......... F-51
Fuel Tank Straps. . . . ......... F -50
Service Diagnosis. . ........ F -52
Specifications. . . . . . . .......... F -53
Vacuum Pump. . ........ F-32, F-36
Disassembly. . . . . . .F-37, F-42
Testing. . . . . . . . . . . . ... F -38, F -49
F-2. Carburetor
e Models CJ-2A, CJ-3A
Model CJ-2A is equipped with Carter carburetor,
model 596S. Model CJ-3A is equipped with Carter
carburetor, model 636SA. Both of these carburetors
are basically the same and many parts are inter-
changeable. The differences between the two
carburetors are mostly external and obvious and
the service procedures given below will apply to
both carburetors.
These carburetors are of the plain tube type, Fig.
113, with a throttle operated accelerator pump and
economizer device. The carburetor is a precision
instrument designed to deliver the proper fuel and
air ratios for all engine speeds. By proper cleaning
and replacing all worn parts, the carburetor will
function correctly.
The carburetor may be divided into five circuits:
float circuit, low-speed circuit, high-speed circuit,
pump circuit, and choke circuit.
By treating each circuit separately, the diagnosing
of trouble and the repair of the carburetor is made
much simpler.
FIG. 112-FUEL SYSTEM-MODELS CJ-3B, CJ-5, CJ-6
1-Elbow
2-Carburetor
3-Fuel Tank Hold Down Strap
4-Fuel Tank
5-Fuel Gauge Tank Sendin!( Unit
6-Screw and Lockwasher
7-Pipe Plug
8--Clip
9-Fuel Line
1 O~Line-to-Pump Connection
11-Fuel and Vacuum Pump
12-Pump-to-Carburetor Tube
93