Isuzu Trooper (1998-2002 year). Manual - part 576

6B – 12 ENGINE COOLING

Torque:

For A.C. Generator fixing bolt

40 N·m (4.1 kg·m/30 lb ft)

For Adjusting plate fixing bolt

24 N·m (2.4 kg·m/17 lb ft)

For Adjusting plate lock bolt

20 N·m (2.0 kg·m/14 lb ft)

2) Adjust the A/C compressor drive belt by tightening

the belt tensioner bolt.

Legend

(1) Crankshaft Pulley
(2) A.C. Generator Pulley
(3) Cooling Fan Pulley
(4) A/C Compressor Pulley
(5) Belt Tensioner Pulley

5

3

2

4

1

012RW110

ENGINE FUEL 6C – 1

ENGINE FUEL

CONTENTS

GENERAL DESCRIPTION

General Description  . . . . . . . . . . . . . . . . . . 

6C–1

On-Vehicle Service  . . . . . . . . . . . . . . . . . . 

6C–7

Fuel Filter Assembly . . . . . . . . . . . . . . . . 

6C–7

Fuel Filter Cartridge . . . . . . . . . . . . . . . . 

6C–7

Injector . . . . . . . . . . . . . . . . . . . . . . . . . . 

6C–9

Fuel Pump Pipe . . . . . . . . . . . . . . . . . . . 

6C–13

High Pressure Oil Pump . . . . . . . . . . . . . 

6C–15

Fuel Tank . . . . . . . . . . . . . . . . . . . . . . . . 

6C–20

Fuel Gauge Unit . . . . . . . . . . . . . . . . . . . 

6C–21

Fuel Filler Cap . . . . . . . . . . . . . . . . . . . . 

6C–21

To realize the compatibility between low exhaust
emission and high engine output, an HEUI
(Hydraulically actuated Electronically controlled Unit
Injector) system, has been introduced. This system is
comprised of a hydraulic system, fuel system, and
electronic control system, using a high-pressure oil
pump in place of the conventional fuel injection pump.
The oil pressurized by means of this pump and by
signals from the ECM (Electronic Control Module)
actuates the fuel injector provided for each cylinder.
Inside of the fuel injector, fuel pressure is increased due
to the high-pressure oil. The ECM detects the driving
state of the vehicle, forms, signals sent by engine and
other part sensors, which determines the optimum fuel
injection amount and timing, thus controlling the fuel
injectors. Thus high engine output, good fuel economy,
and low exhaust emission are realized.

When working on the fuel system, there are several
things to keep in mind:

1) Any time the fuel system is being worked on,

disconnect the negative battery cable except for
those tests where battery voltage is required.

2) Always keep a dry chemical (Class B) fire

extinguisher near the work area.

3) Replace all pipes with the same pipe and fittings

that were removed.
Clean and inspect “O” rings. Replace where
required.

4) Always relieve the line pressure before servicing

any fuel system components.

5) Do not attempt repairs on the fuel system until you

have read the instructions and checked the pictures
relating to that repair.

6) After maintenance work, push priming pump and

send enough fuel to the fuel system before starting
the engine.

NOTE: In comparison with the conventional engine,
the capacity of fuel passage in the 4JX1 engine is
larger. It takes the priming pump more time to fill the
engine with fuel.

SECTION

6C – 2 ENGINE FUEL

FUEL FLOW

1

14

Except above region

8

9

10

11

1

2

2

4

12

5

6

7

3

13

14

For Europe, Nicaragua,
Argentina, Philippin

11

4

Legend

(1)

Fuel Filler Cap

(2)

Fuel Tank

(3)

Rollover Valve

(4)

Fuel Supply Pipe

(5)

Fuel Filter with Priming Pump

(6)

Fuel Pump

(7)

High Pressure Oil Pump

(8)

Cylinder Head

(9)

Injector

(10)

Orifice

(11)

Fuel Return Pipe

(12)

Fuel Tank Pressure Release Hose

(13)

Intake Air Duct

(14)

Fuel Tank Pressure Control Valve

040R200001

ENGINE FUEL 6C – 3

FUEL PUMP

1

2

3

4

Legend

(1)

High Pressure Oil Pump

(2)

To Injector

(3)

From Fuel Tank

(4)

Fuel Pump

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