0300-42
WILLYS MODEL "MB" &TON
4
x
4
GOVERNMENT
TRUCK
FUEL
SYSTEM
.
.
-
..
.
-
Pump
Owratlng
Lever
Aariembl~
pumu.Arm
snd
Collar
Asaembly
Pumli
Connecting
Liok
purnu
Arm
Spring
Pumli
Plunger
and
Rad
AsKmblY
Pumn
Plunwr
Spring
Dlachnrge
Diu
Ciicck
Assemblv
Intake
Bal1
Chrck
Aisrmblv
Pump
Check
Stcainer
purnu
Check
S~ainci
NUL
Pum~
Jet
Throttlc
Valve
Idle
Part
Rlvet
Plua
Idlr
AdjusLment
krcr
Slirlna
Idle Adjuatment
Screw
The Fuel System, Fig.
2,
consists of the Fuel
Tank, Fuel
Lines, Fuel Filter, Fuel Pump. Carbure-
tor and Air Cleaner.
The most important attention
necessary to the
fuel system is to keep
it
clean and free of water.
It should be periodically inspected for
leaks.
The fuel tank capacity is given on Page
3.
The
tank sets in
a
sump in the floor pan and two drain
holes are incorporated in this sump to
allow for
flushing. When the vehicle leaves the factory a
cap is placed over the front drain hole tokeep out
stones and dirt and another
is placed in the glove
compartment.
Sliould maneuvers in water be neces-
sary, insta11 the second cap over the rear drain hole
from the left
side of the vehicle. After passing
through the water
remove cap and return it to the
glove compartment.
CAUTION-Whenever the vehicle is to be stored
for an extended period, the fuel system should be
completely
drained. The engine.started and allowed
to run until carburetor is emptted. This wil1 avoid
oxidation of
tlie gasoline, resulting in the formation
of gum in the units of the Fuel System.
Information pertaining to the operation and
Wlllgi
Poid
Part
Pert
NO.
NO.
NO.
Pum~
Jat
als Nozztc
mrape
Plus
and
Gaaket
Auicmbb
Meiering
Rod
Mererina
Rod
Jet
and Gaakcl
Aarambly
Idle
Welt
let
Loa
Swd
Jet
AsemblY
Floal
and
kcr
Aaaemblv
Needle.
Pin,
Suring
and
Seat
Asiembly
Chnkc
Valvc
As~tmbly
Choke
Shaft
and
Lever
Assembly
Meterinp
Rad
Slirlog
Noule
Norzle
RLLalnet
Plug
Metcrina
Ral
Dir
servicing of the units wntained in fuel system are
covered in the succeeding paragraphs.
Carburetor
The Carter Carburetor, Model WO-539S, Fig.
1,
is the plain tube type with
a
throttle operated
accelerator pump and economizing
device.
Since carburetion is dependent in several ways
upon both compression and ignition, it should al-
ways be checked last in an engine tune-up.
The carburetor
delivers the proper fuel and
air
ratios for
al1
sp~eds of the engine. By proper
cleaning and replacing
al1 worn parts, the carbure-
tor wil1 function correctly.
The carburetor can be divided
int0 five circuits
which are:
1.
Float Circuit
2.
Low Speed Circuit
3.
High Speed Circuit
4.
Pump Circuit
5. Choke Circuit
By treating each circuit separately,
the
study
and repair of the carburetor is made much easier.
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