1987 SUZUKI GRAND VITARA Service Repair Manual

2) Take out air cleaner element from air cleaner
case and blow off dust with compressed air’
from inside of element.
3) Install new element and cap by fitting cap
groove to case securely, and be sure to clamp
cap.
4) Install air cleaner outlet hose.
Fig. 4-2-3
Fig. 4-2-4- 1
1. Clamp2. Groove
3) Install element and cap by fitting cap groove
to case securely, and be sure to clamp cap.
4) Install air cleaner outlet hose.
[Replacement]
1) Remove air cleaner outlet hose and case cap.
2) Remove air cleaner element.
Fig. 4-2-4
4-30

4-3.FUEL PUMP, FILTER AND LINES
GENERAL DESCRIPTION
The main components of the fuel system are fuel tank, fuel pump and fuel filter and it includes three
lines; fuel feed line, fuel return line and fuel vapor line.
Fig. 4-Z-5
4-31

Fuel Pulp
A mechanical fuel pump is mounted on the
cylinder head.
The diaphragm in fuel pump is actuated from
the cam on the engine camshaft, through a fuel
pump rod and a rocker arm of fuel pump. A
rocker arm rides on the cam through the fuel
pump rod and moves the pump diaphragm up
and the fuel pump feeds the fuel into carburetor.
A fuel return circuit is provided in this pump in
order to avoid “vapor lock”. When the float
chamber refuses to admit fuel, a slight pressure
buildup occurs on the discharge side of the
pump and this buildup causes the fuel to flow
through the return circuit to the fuel tank. In
other words, the fuel pump is kept in action as
long as the engine is running, so that the con-
stant flow of fuel through the pump keeps it
cool.
2
Fig. 4-2-8
Fig. 4-2-6
Fuel Filter
Fuel filter is located at the front part of fuel
tank, inside the right-hand side of chassis.
Fuel enters the filter through its inlet hose and,
after passing through filtering element, comes
out of its outlet hose communicated to the fuel
pump. This filter is not meant to be disassem-
bled. It is of cartridge type, consisting of a
filtering element in a plastic case.
1
1. Fuel pump
2. inlet hose
3. Outlet hose4. Return hose
6
1. Inlet
2. Outlet
Fig. 4-2-9
1.Inlet
2.Outlet
3.Return tube
4.inlet valve
5.Outlet valve
6.Diaphragm
7.Rocker arm
8.Fuel pump rod
Fig. 4-2-7
4-32

Fuel Filler Cap
The fuel tank filler neck has a pressure-vacuum
cap.
A ratchet tightening device on the threaded fuel
filler cap reduces the chances of incorrect
installation, which would prevent sealing fuel
vapors.
After the gasket on fuel filler cap and the filler
neck flange contact, the ratchet produces a
loud clicking noise, indicating the seal has been
set.
This cap has pressure relief valve and vacuum
relief valve inside.
If the pressure of fuel vapor in fuel tank should
exceed that for which fuel system is designed,
the pressure relief valve opens to relieve the
pressure.
The vacuum relief valve opens to relieve the
vacuum created in fuel tank.
1. Pressure relief valve2. Vacuum relief valve
3. Gasket
Fig. 4-2- 10Fuel filler cap cross-section
REMOVAL AND INSTALLATION
CALJTION:
Before attempting. service of any type on
fuel system, the following cautions should
be always observed.
l Disconnect negative cable at battery.
l DO NOT smoke, and place “NO SMOK-
I NG” signs near work area.
l Be sure to have COZ fire extinguisher
handy.
0 Wear safety glasses.
l To release fuel vapor pressure in fuel
tank, remove fuel filler cap from fuel
filler neck and then reinstall it. If prec
sure in fuel tank is not released before-
hand, fuel in fuel tank may come out of
fuel hoses due to the pressure when they
are disconnected.
l Note that fuel hose connection varies
with each type of pipe. Be sure to
connect and clamp each hose correctly
referring to the following.
With following type pipe, fit hose as far as it reachespipe joint as shown./
Clamp securely at a position
3 to 7 mm (0.12 - 0.27 in.)from hose end.
With following type pipe, fit hose as far as its peri-pheral projection as shown.
\
Clamp securely at a position
3 to 7 mm (0.12 - 0.27 in.)
from hose end.
With following type pipe, fit hose es far as its bentpart as shown or till pipe is about 20 to 30 mm (0.79
- 1.18 in.) into the hose.
Clamp securely at a positior
3 to 7 mm (0.12 - 0.27 in.:from hose end.
4-33

,Fuel Pump
[ Rem’oval]
1) Disconnect negative cable from battery.
2) Remove fuel filler cap from fuel filler neck to
release fuel vapor pressure in fuel tank. After
releasing, reinstall the cap.
3) Disconnect fuel inlet, outlet and return hoses
from fuel pump.
Fuel Filter
[Removal]
1) Disconnect negative cable from battery.
2) Remove fuel filler cap to release fuel vapor
pressure in fuel tank. After releasing, reinstall
the cap.
3) Disconnect inlet and outlet hoses from fuel
filter.
4) Remove fuel filter with clamp.
[Installation]
1) Install filter and clamp, and connect inlet
and outlet hoses to fuel filter.
NOTE:.
The top connection is for outlet hose, the
lower one for inlet hose.
1. Fuel pump
2. Inlet hose3. Outlet hose
4. Return hose
Fig. 4-2-l 1
4) Remove fuel pump from cylinder head.
5) Remove fuel pump rod from cylinder head.
2
1. Fuel pump rod
2. Cylinder head
[Installation]
Reverse removal procedure for installation
using care for the following.
l After oiling it,install fuel pump rod to
cylinder head.
0 Use new fuel pump gasket.
l Make sure for proper hose connection.
0 Upon completion of installation, start engine
and check fuel hose or its joints for leaks.
1.Fuel filter3.From fueltank
2.To fuel pump4.Clamp
Fig.4-2-13
2) Connect negative cable to battery.
3) After installation, start engine and check it
for leaks.
Fuel Tank
[Removal]
1) Disconnect negative cable from battery.
2) Disconnect fuel level gauge lead wire.
3) To release the pressure in fuel tank, remove
fuel filler cap and then, reinstall it.
4) Raise car on hoist.
5) Drain fuel by removing drain plug.
6) Remove filler hose protector.
7) Disconnect filler hose from fuel tank.
.8) Disconnect fuel hosesand pipe from fuel tank.
9) Remove fuel tank.
4-34

[Fuel tank purging procedure]
WARNING:
This purging procedure will NOT remove
all fuel vapor. Do not attempt any repair
on tank where heat or flame is required, as
an explosion resulting in personal injury
cou Id occur.J
The following procedure is used for purging the
fuel tank.
1) After removing fuel tank, remove all hoses,
fuel level gauge from fuel tank.
2) Drain all remaining fuel from tank.
3) Move tank to flushing area.
4) Fill tank with warm water or tap water, and
agitate vigorously and drain. Repeat this
washing until inside of tank is clean.
Replace tank if inside is rusty.
5) Completely flush out remaining water after
washing.
[ Installation]
Reverse removal procedure for installation using
care for the following.
Tightening torque30-45 Nm
for fuel tank(3.0- 4.5 kg-m)
drain plug(22.0 - 32.5 lb-ft)
Refer to Fig. 4-2-5 for piping and clamp posi-
tions.
l Make sure for correct hose-to-pipe connec-
tion.
l Clamp hoses securely.
l Upon completion of installation, start engine
and check hose joints for leaks.
MAINTENANCE SERVICES
Fuel Lines
Visually inspect fuel lines and connections for
evidence of fuel leakage, hose cracking, and
damage. Make sure all clamps are secure.
Repair leaky joints, if any.
Replace hoses that are suspected of being crack-
ed.
Fig. 4-2-14
Fuel Filler (tank) Cap
Visually inspect gasket of fuel filler cap.
If it is damaged or deteriorated, replace filler cap
with new one.
NOTE:
If cap requires replacement, only a cap with
the same features should be used. Failure to
use correct cap can result in a serious malfunc-
tion of the system.
Fig. 4-2-15
1. Fuel filler cap
2. Fuel filler capgasket
Fuel Filter
As said before, this filter does not permit dis-
assembly: it is to be replaced with a new one
periodically.
Replace fuel filter referring to previous item of
“Fuel Filter Removal and Installation”.
This servicing must be performed in a well
ventilated area and away from any open
flames (such as gas hot water heaters).
4-35

4-4. ACCELERATOR PEDAL
PRECAUTIONS TO BE TAKEN IN ACCELERATOR PEDAL INSTALLATION
“A’,
-w/i
Apply grease to accelerator
cable hook hole of pedal.
Install accelerator pedal
return spring securely as
shown in figure.
Fig. 4-2- 16
Adjustment of full open position
(1)Loosen lock nut and tighten bolt slightly.
(2)Depress Dedal as far as throttle valve opensf&
(3)In this state. bring bolt into contact with
pedal by turning bolt and then loosen boltby 2 tums.
(4) Tighten lock nut there securely.
4-36

SECTION 5
EMISSION CONTROL SYSTEM
CONTENTS
5-1.GENERAL DESCRlPTlOk........................................5-4
POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM........... ..5-5
THERMOSTATICALLY CONTROLLED AIR CLEANER
(TCAC) SYSTEM................................................5-6
EVAPORATIVE EMISSION CONTROL SYSTEM.....................5-7
HOT IDLE COMPENSATOR (HIC)..................................5-8
DECELERATION MIXTURE CONTROL SYSTEM....................5-9
COMPUTER CONTROLLED EMISSION CONTROL SYSTEM.........5-10
BOWL VENTILATION SYSTEM..................................5-12
FUEL CUT SYSTEM..........................................5-13
EXHAUST GAS RECIRCULATION (EGR) SYSTEM..................5-14
5-2.DIAGNOSIS......................................................5-15
5-3.MAINTENANCE SERVICE......................................5-18

PCV SYSTEM..............................................5-18
TCAC SYSTEM..............................................5-19
EVAPORATIVE EMISSION CONTROL SYSTEM...................5-20
HOT IDLE COMPENSATOR (HIC).................................5-21
DECELERATION MIXTURE CONTROL SYSTEM..................5-21
FEED BACK SYSTEM........................................5-22
SWITCH VENT SOLENOID....................................5-36
FUEL CUT SYSTEM..........................................5-36
EGR SYSTEM...............................................5-37
GENERAL..................................................5-18
5-1
5