1979 DATSUN 210 fuel pump

t

1

Primary
main
nozzle

2

Primary
main
air
bleed

3
Primary
slow
air
bleed

4

Primary
slow

jet

5

Primary
main

jet

6
Idle
nozzle

7

Primary
throttle

valve

EF417A

Fig
EF
I9

Portially
Loading

IdUns
nd
slow

system

Passing
through
the
main

jet
the

fuel

passage
is

separated
from
main

line
fuel
flows

through
the
slow

jet

primary
slow
air
bleed
is

ejected
from

the

by

pass
hole
and
idle
nozzle

cp
v

Ii

l

1

Primary
main
air
bleed

2

Primary
slow
air

bleed

3
Anti
fieseling
solenoid
valve

4

Primary
main

jet

5
Idle
nozzle

6

Primary
throttle

valve

EF711

Fig
EF

20

Idling
and
Slow

System

Aceeler

tlns
meeh

nlsm

A

mechanical

accelerating

pump

synchronized
with
the
throttle
valve
is

used
Engine
Fuel

When
throttle
valve
is
closed

piston

rod

is

pushed

up
wi
th

linkage
which

pushes
up
piston
through
piston
return

spring

When

piston
comes
down
inlet

valve

closes
outlet
valve

opens
and

fuel
within
the

pump
is

blown
out

from
the

pump
je
t

by
compressed

piston
return

spring
The
fuel
hits

against
side
wall
of
small
venturi

becoming
minute

drops
and

compen

sating
transient

spareness
of

fuel

1

r

@
CD

V

1
Piston

2

Pump
lever

3

Pump
nozzle

4
Piston

return

spring
5
Inlet
valve
EF239

6
Outlet
valve

7

Primary
throttle
valve

8

Pump
connecting
rod

Fig
EF

21
Accelerating
Mechani
m

Power
v
lve
meeh
nlsm

The
vacuum
actuated
boost

type

power
va
v

mechanism
makes
use
of

the
downward

pulling
force
of
the

air

stream
below
throttle
valve

When

throttle
valve
is

slightly
open

ed

during
light
load

running
a

high

vacuum

p
ston

upward
against
the

spring
leaving

power
valve
closed

When
vacuum

is
lowered

during
full

load

or
acceleration
the

spring
pushes

vacuum

piston
downward

opening

power
valve
to

furnish
fuel

I

t
f

i

1
Vacuum

piston

2
Power
valve

EF240

Fig
EF

22
Power
Valve

EF
9
SECONDARY
SYSTEM

Second

ry
m

ln

system

When
the

primary
throttle
valve
is

wide

open
and

engine
produces
high

power
the

secondary
throttle
valve

begins
to

open
by
the

linkage

However

auxiliary
valve
does
not

open
at
a
slow

speed
due

to
counter

weight
connected
to
valve
shaft

As

engine
picks

up
speeds
the

auxiliary
valve

opens
against
the

load

of

counterweight
and

secondary
sys

em
starts

operation
for

high

power

operation
The
fuel

flowing
out
of
the

passage
at
bottom
of
float
chamt
er

passes
through
secondary
main

jet

The

fuel
is
mixed
wi
th

air

coming

from
main
air
bleed
and

mixture
is

blown
in
to
the
venturi

through
main

nozzle

When

primary
throttle
valve
is

in

full

open

position

secondary
throt

tle
valve
is

also

fully

opened

I

Secl
ndary
slow
air
bleed

2

Secondary
main

air
bleed

3

Secondary
main
nozzle

4

Primary
main
nozzle

5

Primary
main
air

bleed

6

Primary
slow
air

bleed

7

Primary
slow

jet

8
Primary
main

jet

9
Idle
nozzle

10

Primary
throttle
valve

11

Auxiliary
valve

12

Secondary
throttle
valve

13

Secondary
main

jet

14

Counterweight

15

Secondary
slow

jet

EF418A

Fig
EF

23
At
Full

Open
Stow

Speed

I

Secondary
slow
air

bleed

2

Secondary
main
air
bleed

3

Secondary
main
nozzle

4

Primary
main
nozzle

5

Primary
main

air
bleed

6

Primary
slow
air
bleed

7

Primary
slow

jet

8

Primary
main

jet

9
Idle
nozzle

10
Primary
throttle
valve

II

Auxiliary
valve

12
Seco
dary
throttle
valve

13

Secondary
main

jet

14

Counterweight

IS

Secondary
slow

jet

EF419A

Fig
EF
24
At
Full

Open
High
Speed
Engine
Fuel

Secondary
slow

system

Step
system

The
construction
of
this

system

corresponds
to

the

idling
and
slow

system
of
the

primary
system

This

system
aims

at
the

power

filling
up
of
the

gap
when

fuel

supply

is
transferred
from

the

primary
system

to
the

secondary
system
The

stepport

is
located

near
the

auxiliary
valve
in
its

fully
closed
state

ANTI

DIESELING
SYSTEM

The

carburetor
is

equipped
with
an

anti
liese1i

lg
solenoid

valye

As
the

ignition
switch
is

turned
off

the
valve
is

brought
into

operation

shutting
off
the

supply
of

fuel
to

the

slow
circuit

The

following
figure
shows
a
see

tional
view

of
this

control

An

ti
dies

eling
solenoid
valve

Ignition
switch
OFF

ON

t

L
li

FLOAT
SYSTEM

There
is

only
one
float
chamber

while
two
carburetor

systems

primary

and

secondary
are

provided

Fuel
fed
from
the
fuel

pump
flows

through
the
filter
and
needle
valve
into

the
float

chamber
A
constant
fuel

level
is
maintained

by
the

float
and

needle
valve

Because
of

the
inner
air

vent

type

float

chamber
ventilation
fuel
con

sumption
is

not
affected

by
dirt
ac

cumulated
in

the
air
cleaner
Ignition
switch

Q

1

T
Battery

niT

EC
3

Fig
EF
25

Anti
dieseling
Solenoid
Valve

The
needle
valve
includes

special

hard

steel
ball
and
wiD

not
wear
for
all

its

considerably

long
use

Besides
the
insertion
of

a

spring

will

prevent
the

flooding
at

rough
road

running

THROTTLE
OPENER

CONTROL
SYSTEM

T
O
C
S

Except
FU

model

The
function

of
the
throttle

opener

is
to

open
the

throttle
valve
of
the

carburetor

slightly
while
the
car
is
in

EF
10
deceleration

During
deceleration

the

manifold
vacuum
rises
and

the

quan

tity
of
mixture
in
the

engine
is

not

suffICient
for
normal

combustion
to

continue

4
consequently
a

great

amount
of

unburned
HC
is
emitted

Carburetors

equipped
with

the

throttle

opener
supply
the

engine
with

an

adequate
charge
of

combustible

mixture
to
maintain

proper
combus

tion

during
deceleration

resulting
in
a

dramatic
reduction
in
HC

emission

The

system
for
the

manual
trans

mission
model
consists
of

servo
dia

phragm
vlicuum

control
valve
throttle

opener
solenoid
valve

spee
l

detecting

switch
and

amplifier
On

the
auto

matic

transmission
model
an
inhibitor

and
inhibitor

relay
are
used
in

place
of

speed

detecting
switch
and

amplifier

on
the
manual
transmission

model
An

altitude

corrector
fitted
to
vacuum

control
valve

serves
to

automatically

regulate
the

operating
pressure
in

the

system
with

variation
of

atmospheric

pressure

T
o
C
S
n

operatIon

At
the

moment

when
the

manifold

vacuum
increases
as

occurs

upon
de

celeration

the
vacuum

control
valve

opens
to
transfer

the
manifold

vacuum

to
the
servo

diaphragm
chamber
and

the
throttle
valve
of
the

carburetor

opens

slightly

Under
this

condition
a

proper

amount

of
fresh
air

is
sucked

into
the

combustion
chamber
As
the
result

complete
combustion
of
fuel
is

as

sisted

by
this
additional
air

and
the

amount

of
H
C

contained
in

exhaust

gases
is

dramatically
reduced

Throttle

Clpener
sol
nold

valve

operation

Manual

transmission
models

The
throttle

opener
solenoid
valve

is
controlled

by
a

speed

detecting

switch
which
is

actuated

by
the

speed

ometer
needle

As
the

car

sp
ed
falls
below
16

km
h
10
MPH

this
switch
is
acti

vated

producing
a

signal

The

signal
is

led
to
the

amplifier
so

that
the

signal
can
be

amplified
to

a

degree

large
enough
to
actuate
the

Engine
Fuel

Upon
completion
of

adjustment

make
sure
that

link

system
opera
tes

smoothly
It
is

necessary
to
remove
Carburetor

from

engine
in

adjusting
this
accelera

tor

pump
stroke
limiter

1

Remove
carburetor

from

engine

2

Insert
a
l
l

to
I
S
mm
0

043
to

0
059

in
feeler

gauge
a

piece
of

round

stock
of

proper
thickness
is

best

betwee
l
primary
ca

buretor

throat
and
throtile
valve
ACCELERATOR
PUMP

STROKE

LIMITER

In

rmal
service

operation
this

limiter
should

not
be
removed
or

bent

In
J

0

ID

@

l

1IJl

J
J
00

I
f

oj

G
1
3
IO
2

mm
0
051
IO
004
in

Fig
EF
44
AdjlUting
Acce
rator

Pump
Stroke
Limiter
1
Primary
carburetor
throat

2
Throttle
valve

3
Lever

4

Limiter
5
Piston

6

Pin

7
Feeler

gauge

E
F048A

3

With
throttle
valve
held

open

properly
by
feeler

gauge
check

that

lever

barely
contacts

pin
If
lever
and

pin
are
not
in

contact

bend
limiter
until

proper
contact
is

made

OZ
00
A

fID

1

S

@

4
1

Full

travel
of

lever

f

EF049A
A
1
Lever

2
Correct

contact
area

3
Limiter

4
Pin

5

Pistgn
6
Correct
cont
ct
area

7
Lever

8

Limiter

9
Pin

10
Piston

Fig
EF
45
Stroke
Limiter

DASH

POT

I

Idling
speed
of

engine
and
mix

ture
must

be
well

tuned

up
and

engine

sufficiently
warm

2
Turn
throttle
valve

by
hand
and
read

engine
speed
when
dash

pot
just

toucnes

stopper
lever

3

Adjust
position
of
dash

pot
by

tuming
nut
until

engine
speed
is

in
the

specified

range

California

models
Non

Califomia

models

Automatic

transmission
1

900

to
2

100
1
900
to

2
100

Manual
transmission

1
900

tp
2

100
2
300

to
2

500

FU
model

1

900
to
2

100

EF

t8
1
Lock
nut

2
Dash

pot

E

F730

F
ig
EF
4

Ll
dj

ting
h

P
ot

4

Tighten
lock
nuts

5

Make
sure
that

engine
speed

drops
smoothly
from
2

000

to
1
000

rpm
in

about
three

seconds

ACCELERATING
PUMP

I

Visually
inspect

accelerating

pump
cover

for

any

sign
of
fuel

leaks

2

If
fuel

leaks
are
found

check

gasket
and

replace
if

necessary

3

Turn
throttle

valve

by
hand

make
sure
fuel
is

injected

through

injector
nozzle

Note
To

check
or

fuel

injection

peep
into
nozzle
rom

upper
side

while

directing
flashlight
beam
to

ward

primary
barrel

ANTI
DIESELING

SOLENOID

VALVI

Start
the

engine
and

keep
at

idling

speed
Disconnect
the

lead
w

e
for
the

anti
dieseling

solenoid
at
the

connec

tor

If
the

engine
does

not

stop
when

the
lead

wire
is

disconnected
the

solenoid
is

stuck
Reconnect
the
lead

wire
and

start
the

engine
Then
turn

off
the

ignition
switch

If
the

engine
does
not

stop
when

the

ignition
switch
is
turned
off

this

indicates
that
the

striking
solenoid

valve
is

stuck
or

short

circuited

If
the

harness
i
in

good
condition

replace
the
solenoid
valve
as
a
unit

En9ineFuel

DISASSEMBLY
AND
ASSEMBLY

Except
FU

model

A

JS

@fB

@
Choke

chamber

@
Center

body

@
Throttle

chamber

1

Servo

diaphragm
of
throttle

opener

2
Dash

pot

3

Automatic
choke

cover

4

Automatic
choke

I
ody
and

diaphragm
chamber

S

Accelerating

pump
lever

6

Auxiliary
valve

7

Venturi

stopper
screw

8

Primary
and

secondary
maU

venturi

9

Secondary
slow

jet
I

I
l

c
I
liO

JCJ

@

c

1
@

11
i

I

rJ

@

10

Power

valve

11

Secondary
main
air

bleed

12

Primary
main
air
bleed

13

Injector

weight

14

Primary
slow
air
bleed

15

Accelerating
pump

16

Plug

17

Primary
slow

jet

18

Needle
valve

19

Float

20
Anti
c1ieseling

solenoid
valve

21

Primary
main

jet

22

Secondary
main

jet
23
Idle

limiter

cap

24
Idle

adjust
screw

25

Spring

26
Throttle

adjust
screw

27

Spring

28

Primary
and

secondary
throttle

valves

29
Fast
idle

adjust
screw

30

Accelerating
pump
rod

31
Throttle
retum

spring

32
Stroke
limiter

Note
Do
nOt
remove
the

puts

marked
with
an
uterisk

EF420A

Fig
EF
60
c
rburetor

EF
24

FU
model
Engine
Fuel

If

@
Choke
chamber

@
Ceo
ter

body

@
Throttle
chamber

1
Dash

pot

2
An
tomatic
choke

cover

3
Automatic
choke

body
and

diaphragm

chamber

4

Throttle
valve
switch

assembly

5
Throttle

valve
switch

adjust
screw

6
Fast
idle

adjust
screw

7

Secondary
slow

jet
EF567A

8

Secondary
small
venturi

9

Primary
small
venturi

10
Power
valve

11

Secondary
main
air

bleed

12

Plug

13

Primary
main
air
bleed

14

Plug

15

Injector
weight

16

Primary
slow
air
bleed

17

Accelerating
pump

18
Needle
valve

19

Plug
20

Primary
slow

jet

21
Float

22
Anti
dieseling
solenoid

valve

23

Secondary
main

jet

24

Primary
main

jet

25
Idle
limiter

cap

26
Idle

adjust
screw

27
Throttle

adjust
screw

28
Vaeuum
screw

29

Primary
and

secondary
throttle

valves

Note
Do

not
remove
the

parts
muked

with
an

utemk

Fig
EF
61
Carburetor

EF
25

Engine
Fuel

Dhassembly

1

Properly
fitting
wrenches

and

screwdrivers
must
be

used
on
the

nozzles
and

jets
as

well
as
on
the
screws
arid
nuts
and
cafe
must
be

exercised
not
to

damage
any
parts

2

Clean
the
carburetor
thoroughly

before
disa
lSembly

Choke
chamber

parts

Except
FU
model

@

FU
model
3
Do
not

attempt
to
remove

any

parts
marked
with
an
asterisk

Servo

diaphragm
of

throttle

opener

2

Automatic
choke

cover

3
Dash

pot

4

S

pring
hanger

S
Automatic

chl
ke
body
and

diaphragm
chamber

6
Choke
valve

7

Pump
lever

retufn

sprina

8

Accelerating
pump
lever

9

Accelerating
pump
lever

shaft

10

Accelerating
pump
dust
cover

11

Accelerating
pump

12

Primary
slow
air

bleed

13
Needle
valve

14
Float

IS
Stroke
limiter

Notc
Do
Dot
remove

the

parts

marked
with
an

asterisk

EF085A

CHOKE

CHAMBER
PARTS

1

Dash

pot

2

Automatic
choke
cover

3
Automatic
choke

body
and

diaphragm
chamber

4

Throttle
valve
switch

assembly

S

Primary
slow

air
bleed

6
Needle
valve

7

Float

EF

26
EF086A

Fig
EF

62
Chohe

Chamber

Engine
Fuel

Choke
chamber

parts

FU

model

Except

FU
model
R

5

7

@

l
i

1

I
ft

Y

mJ

r

ft
1
@

@

1

EF421A

Tl@@

EF568A

EF
27
1

Secondary
slow

jet

2

Plug

3
Power
valve

bleed
d
mam
au
4

Seeon

ary

bleed
P

imary
maID
aIr

5
r

ight
6

Injector
we

7

Plug

t
8

Primary
slow

Je

d

valve
9
Anti
dieseling
solenOl

t
O
P

imary
malO

Je
1
r

main

Jet
11

Secondary

iliary
valve
12
Aux

screw
13
Venturi

stopper

duv

small
nd

seeon
J
14
Prima
a

ventuns

tl
not
J

eIIlove

the
p
Note
Do

tIt
an

asterISk
markedwt

CENTER

BODY
PARTS

slow

jet
1

Secondary

aU
yen
turi
2

Secondary
sm

Yen
turi
3

Primary
small

4
Power
valve

n

air
bleed
5

Secondary
m3J

6

Plug

on

air
bleed
7

Primary
mm

8

Plug

9

nJ
eetor

weight

pump
10

Accelerating

11

Plug

et
12

Primary
l
w

J

lenoid
valve
13
An
ti
dieseling
50

mamJet
14

Secondary

t
IS

Primary
mamJc

ill

y
valve
16
Aux
ar

the

parts
Do
not

remOVe

t
Note

th
an
utens
marked
WI

EF

63
Center

Body
FIg

Engine
Fuel

Throttle
chamber

parts

Except
FU
model

1
1

4
@

EF087A

1

Throttle
return

spring

2

lluottlc

opencr
adjusuctew

3

Accelerating
pump
rod

4

Fa
t
idle

adjust
5CICW

5

Primary
and

secondary

throttle
valve
6
Sprin8

1
Idle

adjust
screw

8
Idle
limiter
cap

9

Spring

10
Throttle
adjust
rew

oG

I
l

I
r

Y
Note
Do
not
remove
the

puts

ked
with
an
uterisk
FU
model

on

TIlROTfLE
CHAMBER
PARTS

1
Throttle
valve
switch
adjust
screw

2
Fast
idle

adjust
screw

3
limiter

cap

4
Idle

adjust
screw

S
Throttle

adjust
screw

6
Vacuum
screw

7
Primary
and

secondary

throttle

valves

Note
Do
not
remove

the
putl

marked
with
an

uterist
EF864

Fig
EF
64
Throttle
Chamber

EF

28