Isuzu KB P190. Manual - part 801

Fuel is injected into the engine by separate fuel injectors that are mounted in the intake manifold (common chamber).
Fuel is supplied to the injectors under pressure from the fuel tank through the fuel lines and the fuel rail, which is
attached to the top of the common chamber.

A fuel pressure control valve is installed on the fuel rail to maintain fuel line pressure across the injectors under all
operating conditions. Fuel pressure is maintained by controlling the amount of fuel that is supplied from the fuel tank,
based on the demand of the engine via the engine control module (ECM).

Two interchangeable “O” rings are used on the fuel injector and must be replaced when the injectors are removed.
The Multiport Fuel Injection system utilizes an injection system where the injectors turn on at every crankshaft revolution.
The ECM controls the injector on time so that the correct amount of fuel is metered depending on driving conditions.
The V6 engine is designed to use only unleaded petrol.

Unleaded petrol must be used for correct emission control system operation and its use will also minimize spark plug
fouling and extend engine oil life.

Using leaded petrol can damage the emission control system and could void the vehicle warranty. All vehicles are
equipped with an Evaporative Emission Control System. The purpose of the system is to minimize the escape of fuel
vapours into the atmosphere.

Service Precautions

•

Use extreme care when working on the fuel system and follow all safety precautions.

•

When working on the fuel system, disconnect the battery ground cable except for tests where battery voltage is
required.

•

Always keep a dry chemical (class B) fire extinguisher near the work area.

•

Relace all fuel lines and fittings with the same type of line and fitting as those removed.

•

Clean and inspect “O” rings carefully and replace if required.

•

Always depressurize the fuel lines before servicing any fuel system components.

•

Do not attempt any repairs on the fuel system until, all warnings and instructions, relating to that repair have been
read and ensure all notices and cautions are adhered to.

•

Do not allow any naked frames or sparks near the work area when working on the fuel system.

•

If draining of the fuel system is required, this should be done in a well ventilated area.

•

Protect the fuel lines and associated parts from thermal damage, spattering when welding.

Fuel System – V6

Page 6C – 4

1.1

WARNING, CAUTION and NOTES

This Section contains various WARNINGS, CAUTIONS and NOTE statements that you must observe carefully to reduce
the risk of death or injury during service, repair procedures or vehicle operation. Incorrect service or repair procedures
may damage the vehicle or cause operational faults. WARNINGS, CAUTION and NOTE statements are not exhaustive.
GM HOLDEN LTD can not possibly warn of all the potentially hazardous consequences of failure to follow these
instructions.

Definition of WARNING, CAUTION and NOTE Statements

Diagnosis and repair procedures in this Section contain both general and specific WARNING, CAUTION and NOTE
statements. GM HOLDEN LTD is dedicated to the presentation of service information that helps the technician to
diagnose and repair the systems necessary for proper operation of the vehicle. Certain procedures may present a hazard
to the technician if they are not followed in the recommended manner. WARNING, CAUTION and NOTE statements are
designed to help prevent these hazards from occurring, but not all hazards can be foreseen.

WARNING defined

A WARNING statement immediately precedes an operating procedure or maintenance practice which, if not correctly
followed, could result in death or injury. A WARNING statement alerts you to take necessary action or not to take a
prohibited action. If a WARNING statement is ignored, the following consequences may occur:

•

Death or injury to the technician or other personnel working on the vehicle,

•

Death or injury to other people in or near the workplace area, and / or

•

Death or injury to the driver / or passenger(s) of the vehicle or other people, if the vehicle has been improperly
repaired.

CAUTION defined

A CAUTION statement immediately precedes an operating procedure or maintenance practice which, if not correctly
followed, could result in damage to or destruction of equipment, or corruption of data. If a CAUTION statement is ignored,
the following consequences may occur:

•

Damage to the vehicle,

•

Unnecessary vehicle repairs or component replacement,

•

Faulty operation or performance of any system or component being repaired,

•

Damage to any system or components which depend on the proper operation of the system or component being
repaired,

•

Faulty operation or performance of any systems or components which depend on the proper operation or
performance of the system or component under repair,

•

Damage to fasteners, basic tools or special tools and / or

•

Leakage of coolant, lubricant or other vital fluids.

NOTE defined

A NOTE statement immediately precedes or follows an operating procedure, maintenance practice or condition that
requires highlighting. A NOTE statement also emphasises necessary characteristics of a diagnostic or repair procedure.
A NOTE statement is designed to:

•

Clarify a procedure,

•

Present additional information for accomplishing a procedure,

•

Give insight into the reasons for performing a procedure in the recommended manner, and / or

•

Present information that gives the technician the benefit of past experience in accomplishing a procedure with
greater ease.

Fuel System – V6

Page 6C – 5

2 System

Components

Fuel System

Figure 6C – 1

Legend

1 Fuel

Tank

Fuel Pump and Sender Assembly

3 Fuel

Filter

Fuel Feed Line

Evaporative Control Valve

Fuel Pressure Test Point

Evaporative Return Line

8 Evaporative

Canister

Description

The modular fuel pump and sender assembly maintains an optimum fuel level in the reservoir. This ensures a
continuous fuel flow under all fuel level conditions and vehicle attitudes. The modular fuel pump and sender
assembly also provides an accurate means of measuring the fuel level within the fuel tank.

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