Jaguar XJ (X350). Manual — part 655
Fuel Injector
Item
Part Number
Description
1
—
Electrical connector
2
—
Fuel injector body
3
—
Fuel injector leak-off retaining clip
4
—
Fuel injector nozzle
5
—
Fuel injector sealing washer
6
Fuel injector retaining clamp
7
High pressure fuel line connection
CAUTION: If any of the high pressure fuel pipe retaining nuts are loosened, the high
pressure fuel pipe it is installed to must be renewed. Failure to follow this instruction may allow
metal fragments to enter the fuel system and result in damage to the fuel system components or
engine.
CAUTION: The high pressure fuel line olive end deforms and work hardens during
installation. If any of the high pressure fuel pipe retaining nuts are loosened, the high pressure fuel
pipe it is installed to must be renewed. Failure to follow this instruction may allow the high-
pressure fuel line to leak.
Fuel Injectors
The fuel injectors are operated electrically by the engine control module (ECM) and inject a precise
amount of fuel into the combustion chamber at the required time.
The injectors have been designed to:
allow pilot and main injections with short intervals between each injection.
be fully electrically controlled.
Fuel Filter
The diesel fuel filter is located on the left-hand side of the engine compartment. Incorporated in to
the fuel filter housing is a bimetallic valve which will start to close at 30°C (86°F) and will fully close at
50°C (122°F).
When the bimetallic valve is open, warm fuel is directed in to the fuel filter to prevent waxing. When
the fuel temperature increases, the bimetallic valve closes, diverting fuel through the under-floor
fuel cooler which then lowers the fuel temperature before returning the fuel back to the fuel filter.
This allows fuel to be supplied to the fuel injection pump at the optimum inlet temperature of
between -30°C to 80°C.
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Diagnosis and testing
Fuel Charging and Controls
Principle of operation
Common rail diesel
The 2.7L fuel injection system is a common-rail design, running at the high-pressures (up to 1,650 bar
or 23,930 lb/in²) typical of such systems.
The fuel is drawn from the fuel tank by an electric fuel pump module and delivered to the transfer
pump side of a fuel injection pump driven by the engine. For additional information on the fuel
injection pump,
Fuel Charging and Controls
The fuel volume control valve (FVCV) regulates the amount of fuel supplied to the high-pressure side
of the fuel injection pump, while the fuel pressure control valve (FPCV) regulates the pressure.
The high-pressure fuel is delivered to the fuel rail where it is stored, ready for use by the fuel
injectors.
The fuel injectors are Piezo type, and are controlled by the engine control module (ECM) from inputs
from the engine management sensors.
The fuel injectors operate in stages, giving a pilot injection before the main injection to reduce
detonation noise and help improve the efficiency of the engine.
For additional information,
Fuel Charging and Controls
Overview
There are changes to the engine management system (EMS) for 2006 my, the most obvious of which
will be the change to 7-digit diagnostic trouble codes (DTCs) from the familiar 5-digit.
Refer to the DTC index in this section for guidance on how to use these codes with the Jaguar
approved diagnostic system or a scan tool.
Inspection and Verification
WARNING: Do NOT carry out any work on the fuel system with the engine running. The fuel
pressure within the system can be as high as 1650 bar (23,930 lb/in²). Failure to follow this
instruction may result in personal injury.
WARNING: Eye protection must be worn at all times when working on or near any fuel
related components. Failure to follow this instruction may result in personal injury.
WARNING: This procedure involves fuel handling. Be prepared for fuel spillage at all times
and always observe fuel handling precautions. Failure to follow this instruction may result in
personal injury.
WARNING: After carrying out repairs, the fuel system must be checked visually for leaks.
This should be done after the engine has been run, but with the engine switched OFF. Failure to
follow this instruction may result in personal injury.
WARNING: If taken internally, DO NOT induce vomiting. Seek immediate medical attention.
Failure to follow this instruction may result in personal injury.
WARNING: If fuel contacts the eyes, flush the eyes with cold water or eyewash solution and
seek medical attention. Failure to follow this instruction may result in personal injury.
WARNING: Wash hands thoroughly after handling, as prolonged contact may cause
irritation. Should irritation develop, seek medical attention. Failure to follow this instruction may
result in personal injury.
CAUTION: Before disconnecting any part of the system, it is imperative that all dust, dirt
and debris is removed from around components to prevent ingress of foreign matter into the fuel
system. Failure to follow this instruction may result in damage to the vehicle.
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