1977 DATSUN PICK-UP fuel filter

CLEANING
AND

INSPECTION

Dirt

gum
wuler
or
l
arbon
con

taminatiun
in

or
on
exterior

moving

parts
of
a

arburctor
arc
often

respon

sihk
for

unsatisfactory
performance

For
this

reason
efficient
carbutetioll

dcpends
upon
careful

cleaning
and

inspection
while

servicing

I

Blow
all

passages
and

castings

with

compressed
air

and
blow
off
all

parts
until

dry

Note
Do
not

pass
drills

or
wires

through
calibrated

jet
or

passaaa

as
this

may
enlarge
orirlce
and

seriously
affect
carburetor
calibrs

lion

2

Check
all

parts
for
wear
If
wear

is

noted
damaged

parts
must
be
re

placed
Note

especially
the

following
Engine
Fuel

I
Check
float
needle

and
seat
for

wear
If
wear
is

noted

assembly
must

be

replaced

2
Check
throule
and
choke
shaft

bores
in
throtlle
chamber
and
choice

chamber
for
wear
or

out
of
roundness

3
Inspect
idle

adjusting
needle
for

burrs
or

ridges
Such
a

condition
re

quires
replacemen
1

3

Inspect
gaskets
0
see
if

they

appear
hard
or
briUle
or

if

edges
are

torn
or
distorted
If

any
such
condi

tion
i
noted

they
must
be

replaced

4
Check
filter
screen
for
dirt
or
lint

Clean
and
if
screen
is
distorted
or

remain

plugged
replace

5
Check

linkage
for

operating

condition

6

Inspect
operation
of

accelerating

pump
Pour
f
el
into

jloat
chamber

and
make
throtlle
lever

operate
Check

condition
of
fuel

injection
from

the

EF
34
accelerating
nowe

7

Push
connecting
rod

of
dia

phragm
chamber
and
block

passage
of

vacuum
with

finger
When

connecting

rod
becomes
free
check
for

leakage
of

air

or

damage
to

diaphragm

Jets

Carburetor

performance
depends

on

jet
and
air
bleed
That
is

why

these

components
must
be

fabricated

with
utmost
care
To

clean
them

use

cleaning
solvent
and
blow
air

on
them

Larger
inner
numbers

tamped
on
the

jet
indicate

larger
diameters
Ac

cordingly
main
and

slow

jets
with

lalger
nUmbers

provide
richer
mixture

the
smaller
the
numbers
the
leaner
the

mixture
Conversely
the
main
and

slow
air
bleeds

through
which
air
to

passes
through
make
the
fueLleaner
if

they
bear

larger
numbers
the
smaller

the
numbers

the
richer

the
fuel

3

Check

ignition
system
with

regard

to

the

following
items

Refer
to

Inspection
of

Ignition
System

1

Ignition
AMP

2
Distributor
Emission
Control

System

3

Ignition
coil

4

High
tension
code

5

Spark

plug

4

Check
idle

CO

adjustment
Refer

to

Inspection
of
Idle

CO

Adjustment
Note
Even
if
there
is

nothing

wrong

with

engine
the

warning
lamp
may

come
on
if
vebicle
is

being
driven

on
a

steep
slope

continuously
in

lower

gears
at

high
engine
speeds

EVAPORATIVE

EMISSION

CONTROL
SYSTEM

CONTENTS

DESCRIPTION

OPERATION

INSPECTION

FUEL
TANK

VAPOR
LIQUID

SEPARATOR

AND

VAPOR
VENT
LINE

DESCRIPTION

The

evaporative
emission
control

system
is

used
to

reduce

hydrocarbons

emitted
to
the

atmosphere
from
the

fuel

system
This

reduction
of

hydro
EC
30

EC

30

EC

31
CARBON

CANISTER
PURGE
CONTROL

VALVE

CARBON
CANISTER

FILTER

FUEL

TANK

VACUUM
RELIEF
VALVE
IEC
32

IEC
32

EC

32

EC
31

carbons
is

accomplished
by
activated

charcoals
in
the
carbon
canister

This

system
is
made

up
to

the

following

I

Fuel
tank
with

positive

sealing
filler

cap

@
2

Vapor
liquid
separator

3

Vapor
vent

line

4
Carbon

canister

5
Vacuum

signal
line

6
Canister

purge
line

5

OPERATION

Fuel

vapors
from

the
sealed
fuel

tank
are
led

into
the
carbon
canister
1
Fuel
tank

2
Fuel
nIler

cap
with
vacuum

relief

valve

3

liquid

vapor
separator
4

Vapor
vent
line

5

Canister

purge
line

6
Vacuum

signal
line

7
Carbon

canister

EF274

Fig
EC
76

Schematic

drawing
of
l
Iaporotive

emiaion

control6ydem

The

canister
is
fined
with
activated

charcoals

to
absorb

the
fuel

vapors

EC
30
when
the

engirie
is

at
rest
or
at

idlin
ll

See

Figure
EC

77

J

1
Fuel
tank

2

Fuel
f1l1er

cap
with

vacuum

relief
valve

3

Liquid
vapor

separator

4

Vapor
vent
line

5
Vacuum

signalUne

As
the
throttle
valve

opens
and

vehicle

speed
increases

vacuum

pres

sure
in

the
vacuum

signal
line
forces

rHL
JL

I

EC785

INSPECTION

FUEL
TANK

VAPOR

LIQUID
SEPARATOR

AND

VAPOR
VENT
LINE

I

Check
all
hoses
and
fuel

tank

mler

cap

2
Disconnect
the

vapor
vent

line

connecting
carbon
canister
to

vapor

liquid
separator

3
Connect
a
3

way
connector

a
Emission

Control

System

Close
at

idling

Open
at
rest

i

J

17
f

Fuel

vapor

6
Canister
purge
line

7
Throttle
valv

8

Engine

9
Carbon
canister

10
Activated
carbon

11

Screen
12
Filter

13

Purge
control
valve

14

Spring

15

Diaphragm

16
Fixed

orifice
i

j

EC784

Fig
EC
77

Evaporative
emu
ion
control

sy
tem

Fuel

vapor
flow
when

engine
i6

at
red
or

idling

the

purge
control
valve
to

open
and

admits
an

orifice
to
intake
manifold

and
fuel

vapor
is

then
drawn
into
the

I

J

o
I

Fuel

vapor

Fresh
air
intake

manifold

through
the
canister

purge
line
See

Figure
EC
7B

Fig
EC
78

Evaporative
emiuion
control

system

Fuel

vapor
flow
when

engine
i

running

manometer
and
a
cock
or
an

equiva

lent
3

way

charge
cock
to

the
end
of

the

vent
line

4

Supply
fresh
air
into

the

vapor

vent
line

through
the
cock
little

by

little
until

pressure
becomes
368

mrnH20

14
5
inH20

5
Shut
the
cock

completely
and

leave
it

unattended

6
After
2
5
minutes

measure
the

height
of
the

liquid
in
the

manometer

7

Variation
of

height
should
remain

EC
31
with
25
mmH20
0
98
inH20

8
When
filler

cap
does
not
close

completely
the

height
should

drop
to

zero
in

a
short
time

9
I
f

the

height
does
not

drop
to

zero
in

a
short
time
when
filler

cap
is

removed
it
is

the
cause
of
a

stuffy

hose

Note
In

case
the

vent
line
is

stuffy

the

breathing
in
fuel
tank
is
not

thoroughly
made
thus

causing
in

sufficient

delivery
of
fuel
to

engine

or

vapor
lock
It
must
therefore
be

1

3
connectur

COCk

Air
Manometer
Emission
Control

System

repaired
or

replaced

368
mmH20

14
5
inH20

LL

IPO
liqUid
epo
o

36

r
@

Carbon
canister

EC786

Fig
EC
79

Checking

evaporative
emmion

control

syatem

CARBON

CANISTER
PURGE

CONTROL
VALVE

Check
for
fuel

vapor
leakage
in

the

distributor
vacuum
line
at

diaphragm

of

carbon

canister

purge
control
valve

To

check
for

leakage
proceed
as

follows

I

Disconnect
rubber
hose
in

the

line

between
T
connector

and
carbon

canister
at
T

connector

2

Inhale
air
into
the

opening
of

rubber
hose

running
to

vacuum
hole
in

carbon

canister
and

ensure
that
there

is
no

leak

ET349

Fig
EC
so

Checking
carbon
canuter

purge
control
valve
3
If
there
is

a
leak

remove

top

cover
from

purge
control
valve

and

check
for
dislocated

or
cracked
dia

phragm
If

necessary

replace
dia

phragm
kit

which
is
made

up
of
a

retainer
a

diaphragm
and
a

spring

@

@

1
Cover

2

Diaphragm

3
Retainer

4

Spring

ET350

Fig
EC
81
Carbon

catU
ter

purge

control
valve

CARBON

CANISTER
FILTER

Check
for
a
contaminated

element

Element

can
be
removed

at
the

bottom
of

canister

installed
on
vehicle

body

EC
32
ET37Q

Fig
EC
s2

Replacing
carbon

canuter

filter

FUEL
TANK

VACUUM

RELIEF
VALVE

Remove
fuel
filler

cap
and
see
it

functions

properly

I

Wipe
clean
valve

housing
and
have

it
in

your
mouth

2

Inhale
air
A

slight
resistance
ac

companied
by
valve
indicates
that

valve
is
in

good
mechanical
condition

Note

also
that

by
further

inhaling
air

the
resistance

should
be

disappeared

with

valve
clicks

3
If

valve
is

clogged
or
if

no
resist

ance
is

felt

replace
cap
as
an
assem

bled

uni
t

l

u

ET369

Fig
EC

83
Fuel

filler
cap

Detail
A

Detail
D

REMOVAL
Engine
Control
Fuel

Exhaust

Systems

Detail
Bn
4

Detail
e

@

Detail
E

B

Fuel
tank
See

Figure
FE
a

I
Disconnect

battery

ground
cable

2
Remove
drain

plug
and
receive

the

remaining
fuel
into
a

suitable

container

3
Disconnect
filler
tube

fro
filler

hose

4
Remove

fuel
tank

securing
bolts

5
Disconnect

two
ventilation
hoses

fuel
return
hose
and
fuel
outlet
hose

from
fuel

tank

6
Disconnect
fuel
tank

gauge
unit

wires

at
connector

7
Remove

fuel
tank

Note

Plug
hose

and
tube

opening
l
to

prevent
entry
of
dust
or
dirt
while

removing

ReservoIr
tank

1

Disconnect

battery
ground
cable

2
Disconnect
two
ventilation
hoses

evaporation
hose
and
breather
hose

3
Remove
reservoir
tank

securing

bolts

and
remove
tank
with

protector
Note

Plug
hose
and
tube

opening
l
to

prevent
entry
of
dust
or

dirt
while

removing

Fuel

tank

gauge
unit

Disconnect

battery
ground
cable

2

Disconnect
wires

from
fuel
tank

gauge
unit

3

Remove
fuel

tank
For
details

refer
to
fuel
tank
removal

4

Unit

gauge
is
a

bayonet
type
and

can

be
removed

by

turning
it
counter

clockwise
with

screwdriver

Fuel

piping
See

Figure
FE
4

Fuel

tubes
are

serviced
as
an
as

sembly
so
that

replacement
of

fuel

tube
can

be

easily
done
However
do

not
disconnect

any
fuel
line
unless

absolu

tely

necessary

I

Drain
fuel
from
fuel
tank

2

Loosen
fuel

hose

clamps
and
dis

connect

fuel
tubes
on

each
end

Note

Plug
hose
and
tube

openings
to

FE

5
Detail
F
Detail

G

Detail
U

Detail
T

FE261

Fig
FE
4
Fuel

piping

prevent
entry
of

dust
or
dirt
while

removing

3
Unfasten

clips
that
hold
tube

on

under

body
and
remove
tube
from
the

vehicle

Fuel
filter

I
Disconnect
fuel
hoses
from
fuel

filter

by
removing
clamps
See

Figure

FE
5

FE18S

Fig
FE
S

Removing
fuel
filter
clamps

Engine
Control
Fuel
Exhaust

Systems

2
Remove
fuel

filter

INSPECTION

Fuel

tanle

Check
fuel

tank
for

cracks
or

deformation
If

necessary
replace

2
Fuel
hose

Inspect
all
hoses
for
cracks

fatigue

sweating
or
deterioration

Replace
any

hose
that

is

damaged

3
Fuel
tube

Replace
any
fuel
tube
that
is

crack

ed
rusted

collapsed
or
deformed

Note

Inspect
hoses
and
tubes
ac

cording
to
the

periodic
mainte

nance
schedule

4

Fuel
filter

Replace
fuel
filter

according
to

the

periodic
maintenance
schedule
or

when

it
is

clogged
or
restricted

DESCRIPTION

REMOVAL

DESCRIPTION

The
exhaust

systems
installed
on

the
non
California
models
differ
in

specifications
from
those
installed
on

the
California
models
Fuel
filter
is

of
a

cartridge
type

and
cannot
be
cleaned

Always

replace

with
a
new
one

5
Fuel
tank

gauge
unit

Check

gauge
unit

for
rust
deforma

tion
or

deterioration
If

necessary

replace

INSTALLATION

To
install
reverse
the
order
of

removal
Observe
the

following

I

Install
hose

clamps
securely
Do

not

tighten
excessively
to

avoid

damaging
hoses

2
Fasten

clips
holding
fuel
tube
on

under

body
securely
Failure
to
follow

this
caution

could
result
in

damage
to

the
surface

of
fuel

tube

3
Do
not
kink

or
twist

hose
and

tube
when

they
are
routed

EXHAUST
SYSTEM

CONTENTS

FE
6

FE

8
INSPECTION

INSTAllATION

Non
California
models

The
exhaust

system
consists

of
a

front
exhaust
tube
a
main

muffler

assembly
with
rear

tube

mounting

hangers
brackets
and
a
heat

insulator

FE
6
4
Install
fIller
hose
after
fuel

tank

has
been
mounted
in

place
Failure

to

follow
this
caution
could
result
in

leakage
from

around
hose
connections

5
When

installing
fuel
tank

gauge

unit

align
the

projection
of

tank

gauge

unit
with
the

notch
in
fuel

tank
and

tighten
it

securely
Be

sure
to
install

gauge
unit

with
O

ring
in

place

6
Run

engine
and
check
for
leaks
at

connections

Tightening

torque

Drain

plug

5

0
to
6
0

kg
m

36

to
43

ft
Ib

Fuel
tank

securing
bolt

0
8
to
1
I

kg
m

6
to
8
ft
Ib

Reservoir

tank

securing

bolt

032
to
0
44

kg
m

2

to
3

ft
Ib

FE
8

FE
8

California
models

The
exhaust

system
cOllsists
of

a

front
exhaust

tube
a

catalytic
conver

ter

assembly
a
center
tube
a

main

muffler

assembly
with
rear
tube

mounting
hangers
brackets
and
heat

insulators

The

catalytic
converter
is
COD

nected
to
the
front

tube
and
the

center

tube
with
bolts
and
nuts