1977 DATSUN PICK-UP fuel cap

Engine
Fuel

Throttle
chamber

parts

I
Idle

limiter

cap

2
Idle

adjust
screw

3
Idle

adjust
screw

sprinl

4
Throttle

adjust
screw

5
Throttle

adjust
screw

sprini

6
Primary
and
secondary

throttle
valves

7

Nut

Notc

Do
not
remove
the

parlS

marked
with
an
asterisk

@ff

EF827

Fig
EF
66

Removing
throttle
chamlHr

parta

Assembly

To

assemble
reverse
the
disassem

bly

procedcre
taking
care
to
the

following

I

Thoroughly
wash

all
the

parts

before

assembling

2

Inspect
gaskets
to
see
if

they
appear
hard
or
brittle
or
if

edges
are

torn
or

distorted

If

any
of
such
undesirable
condi

tions
is

noted

they
must
be

replaced

3
Install

jet
and
air
bleed

having
the

same
size
number

as
that
of

original
one

4
After
reassembling
carburetor

check
each

rotating
portion
or
sliding

portion
for
smooth

operation

EF

33

Emission
Control

System

EARLY

FUEL

EVAPORATIVE

SYSTEM
E

F
E

DESCRIPTION
spring
and

counterweight
which
are

assembled
on
the

valve
shaft

projecting

to
the

rear
outside
of
the
exhaust

manifold
The

counterweight
is
se

cured
to
the
valve
shaft
with

key
bolt

and

snap
ring
EC
4
A

control
valve
welded
to

the

valve
shaft
is

wtalled
on
the

exhaust

manifold

through

bushing
This
con

trol

valve
is

called
Heat

control

valve
The
heat
control

valve
is

ac

luated

by
the

coil

spring
thermostat
Construction
of
the

early
fuel

evap

orative

system
is

shown
in

Figure

r
I

1

@

rW

9

Sc
w

10
Thennostat

spring

11

Coil
spriiig

12
Control
valve
shaft

13
Heat
control

valve

14

Bushing

15

Cap

16
Exhaust
manifold
1
Intake
manifold

2
Stove

gasket

ManifoktstOve

4
Heat
shield

plate

5

Snap
ring

6

Counterweight

7

Key

g

Stoppel
pin

EC532

Fig
EC
4
Early
Fuel

Evaporutive
tem
E
F
E

The

early
fuel

evaporative
system
is

provided
with
a
chamber
above

a

manifold
stove
moonted
between
the

intake
and
exhaust

manifolds

During

engine

warming
up
air
fuel
mixture
in

the

carburetor
is

heated
in
the
cham

bet

by
exhaust

gases
This
results
in

improved
evaporation
of

atomized
fuel

droplets
in
the
mixture
and
in

smaller

content
of

hydrocarbons
He
in
the

exhaust

gas
especially
in

cold
weather

operation

The
exhaust

gas
flow
from
the

engine
is

obstructed

by
the
heat
con

trol

valve
in
the

exhaust
manifold
and
is

changed
in

direction
as
shown

by

the
solid

lines
in

Figure
EC
4
The

exhaust

gas
heats
the
manifold
stove

Open
close

operation
of
the

heat

control
valve
is
controlled

by
the

counterweight
and
thermostat

spring

which
is
sensitive
to
the

ambient
tem

perature
around
the

exhaust
manifold
With
this
condition
the

heat
control

valve
is
in

the

fully
closed

position

obstructing
the
flow
of

exhaust

gas
As

engine
tempera
lure

goes
up
and

the

ambient

temperature
becomes

high

enough
to
actuate
the
thermostat

spring
the

counterweight
begins
to

rotate
clockwise
and

again
comes
into

con

tact
with

the

stopper
pin
With
this

condition
the

heat
control
valve
is
in

the
full

open
position
and
exhaust

gas

passes
through
the
exhaust
manifold
as

shown

by
the
dotted

lines
in

Figure

EC
4
without
heati

ng
the
manifold

stove
OPERATION

The

counterweight
rotates
counter

clockwise
and

stops
at

the

stopper
pin

mounted
on
the
exhaust

manifold

while

the

engine
temperature
is
low

EC
6

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

Engine
Electrical

System

SERVICE
DATA
AND
SPECIFICATIONS

California

models
Non

California

models

For
Canada

except
for

Canada

BP6ES
ll
BP6ES

BPR6ES
Standard

L45PW
ll
L45PW

BP4E
ll
BP5ES
ll
BP4E

BP5ES
BPR4ES

Type
Hot

type

L46PW
ll

L47PW
ll

L46PW
L47PW
BPR5ES

Cold

type
BP7ES
ll

BP7ES

BPR7ES

LMPW
ll
LMPW

1
0
to
l
l
0
8
to
0

9
0
8
to
0
9

Plug

gap
mm

in

0

039
to
0
043
0

031
to
0
D35
0
031
to
0

035

Tightening
torque
kg
m
ft
Ib

I
1
5
to
2

0
11
to
14

TROUBLE

DIAGNOSES

AND

CORRECTIONS

When

engine
does
not
start

If
there
is

no

problem
in

fuel

system
ignition
system
should
be

checked
This
can
be

easily
done

by

detaching
a

high
tension
wire

from
spark

plug
starting

engine
and

ob

serving
condition
of

spark
that

occurs

between

high
tension

wire
and

spark

plug
terminal

After

checking
this

repair
as

necessary
Note
On
California
models

disc
on

nect
anti

dieseling
solenoid

valve

connector
to

cut
off

supply
of
fuel

to

engine
and

then
observe

the

condition

of

spaIks
while
starter

motor
is

in

operation

Condition
Location

Probable

cause
Corrective
action

No

spark
at
all

Distributor

Faulty
insulation
of
condenser

Non
Cali

Replace

fomia

models

Breakage
of
lead
wire
on
low
tension
side

Repair

Poor
insulation
of

cap
and
rotor
head

Replace

Seized

points
Non
California

models

Repair

Open
pick
up
coil
California
models

Replace

Air

gap
wider
than

specification
Cali

Adjust

fornia

models

Ignition
coil

Wire

breakage
or
short
circuit

of
coil

Replace
with
new
one

High
tension
wire

Wire

coming
off

Repair

Faulty
insulation

Replace

Transistor

ignition
Faulty
transistor

ignition
unit

Replace

unit

California

models

EE
4B

DESCRIPTION

REMOVAL

DESCRIPTION

The
fuel
tank
is4Sliters
II

Ji
U
s

gal
9
Ji

Imper
gal
in

capacity
The

tank
unit
is

mounted
to

the

right
side

of
the
rear

floor

1
Fuel

tank

2
Drain

plug

3
Filler
tube

4

RescfYOir
tank

5
Filler
hose

6
Breather
hose

7
Ventilation
hose

8

Evaporation
hose

9
Fuel
outlet
hose
and
tube

10
Fuel

tank

gauge
unit

11

Protector

12
Bracket

13
Retainer

14
Return

tube
Engine
Control
Fuel
Exhaust

Systems

FUEL
SYSTEM

CONTENTS

FE
4

FE
5
INSPECTION

INSTALLATION
FE
6

FE
6

The
filler
shutter
is
installed
to

the

filler
tube
on
California
models

The
electric
fuel

pump
is

adopted

on
air

conditioner

equipped
models
For

the
electric
fuel

pump
refer
to

Section
EF

FE194

Fig
FE
3
Fuel
tank

FE
4

Engine
Control
Fuel
Exhaust

Systems

I

Wipe
clean
all
the

contact

por

tions
of
tube

joints
allow
them

to

dry

thoroughly

2

Temporarily
mount
in

place

muffler
assembly
as
an

assembled
unit

on
the
vehicle

3
Insert

front
tube
until
it
touches

emboss

m
b
nlfrnnjj

mm

lJ
Ij

@L
J

FE263

Fig
FE
ll
Exhawt
tube

connection

4

Torque
nut

securing
the
male
and

female

tubes
at
the
connection

Tightening
torque
is
1
6

to
2

0

kg
m

12
to
14

ft
lb

5

Squeeze

approximately
5

CC
0
31

cu
in

of
sealant
into

injection
from

sealant
tube
See

Figure
FE
12
Sealant
tube

polyethylene

Injector

Fig
FE
IO
Exhaust
sealant
kit

Be

sure
to

place
cap
back
to
sealant

tube
since
sealant
will

dry

Approximately

5
cc

0
31
Cll
in

FE1l1

Fig
FE
12

Squeezing
sealant
to

injec
tor

6

Position
nozzle
of

injector
to
the

guide
and

press
it

there

firmly
Inject

sealant

slowly
until
sealant
begins
to

flow
out

of
the
slit
of
tube
This

indicates

that
the
bead

requires
no

further
sealant
Excessive
sealant
can

cause
a

clogged
tube

See

Figure

FE

13

After

injecting
wash

injector

thoroughly
in
clean

water
to
remove

all
traces

of
sealant

FE191

Fig
FE
13
Injecting
sealant

FE
9
7
Start

engine
and
let
it
idle

slowly

for
ten
minutes

minimum
to

hilfden

sealant
with
the
heat
of
exhaust

gas

8
Check
the

condition
of

sealant

before

driving
the
vehicle
It

is
also

essential
that
the

vehicle
should
not

be

accelerated

sharply
for
20
to
30

minutes

subsequent
to
this

operation

Noles

a
The
sealant

should
be
used
within

guaranty
term
indicated
on
the

kit

case

b

Exposure
of
sealant
to
the
skin

may

cause
a

rash
Wash
sealant
off
the

skin
with
water

c
Do
not

keep
the

sealant
tube
in

a

place
where
the
ambient

tempera

ture
is

above
400C
I040F
A

sealant
hardened
above
4QoC

I040F
cannot
be
used
The
most

suitable

storage
temperature
is

from

15
to
350C
59
to
950F
If
sealant

becomes
hardened
because
of
low

temperatures
wann
the
sealant

tube
with
lukewarm
water
until
the

sealant
is

softened
Do
not
warm

tube

at
a

temperature
over
400C

1040F
for
a

long
time

d

Thoroughly
read
the
instruction

sheet
furnished
with
the
kit
before

using
the
sealant
i