fuel JAGUAR XJ6 1994 2.G Owner's Manual

striker and the-fuel cap stowage magnet.
The fuel bowl, retained around the filler neck by a clip, containing a drain tube filter located over the mating drain tube,
is rubber moulded onto a steel armature and fitted to the BIW decking panel by five M5 nuts.
The fuel lid latching assembly fitted to the metal armature of the fuel bowl by an M5 nut, includes the locking pin and
the operating actuator.
The actuator operates from the central locking system driven by the security and locking control module
(SLCM).
The fuel tank, mounted across thevehicle behind the passenger compartment rear bulkhead, is held in position by two
retaining straps, tightened by two M5 fixing arrangements.
The fuel tank of AJ16 engined vehicles contains one fuel pump, supplying fuel to the normally aspirated engine and
two fuel pumps, supplyingfuel to the supercharged engine. They are regenerative turbine pumps supplied by
Nippon- Denso. Nominal operating pressure is 3 bar (3.7 bar for supercharged engine) above the manifold depression and
pump delivery is 90 litredhour minimum at 13.2 volts, 3 bar outlet pressure. The pump(s) draw a nominal current of 7 amperes at 13 volts, 3 bar outlet pressure, ambient temperatures. Built in to the pump assembly is a over-pressure
relief valve which blows at 4.5 - 8.5 bar.
Fuel is drawn by the pumps from the fuel tank and is then supplied to the fuel rail via a
70 micron filter and the fuel
feed line connected in series by fuel filter.
The amount of fuel being injected into the engine
is controlled by the fuel injectors combined with the engine control module (ECM). - Any excessive fuel flowing through the system, is returned to the fuel tankvia the fuel regulator valve mounted on the
fuel rail, the fuel return line and the check valve also located inside the tank.
The two filters prevent contaminants from entering the fuel rail and possible damage to the fuel injectors, the engine,
the pump and the underfloor filter.
The fuel pumps are switched on and off by relays controlled by the engine control module
(ECM).
The second fuel pump for the supercharged engine operates only in the higher speed range, switching on at 4000rpm and off at 3200rpm.
The fuel lines are made up of an assembly, combining steel under floor pipes and flexible conductive anti-permeation
tubing. In orderto perform speedy remove and refit operations, the underfloor steel lines are linked through the engine
bay bulkhead to the flexible tubing, leading to the fuel rail and the fuel regulator by using positive sealing, quick-fit
type connectors. The same type connectors, are used to connect the fuel feed and return line to the fuel tank.
Connectors used inside the engine bay are of different sizes tocorrespond with the difference in pipe diameter, whereas
the connectors for the feed and return lines at the fuel tank are the same size.
Except for the return line connector at the fuel tank, two release tools, one for each size of connector are required to
release all remaining connectors.
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Fuel, Emission Control & Engine Management (AJ16)
5.1.2 GENERAL DESCRIPTION
m: WORKING ON THE FUEL SYSTEM MAY RESULT IN FUEL AND FUEL VAPOUR BEING PRESENT IN THE
ATMOSPHERE. FUEL VAPOUR IS EXTREMELY FLAMMABLE, HENCE GREAT CARE MUST BE TAKEN WHllST WORKING ON THE FUEL SYSTEM. ADHERE STRICTLY TO THE FOLLOWING PRECAUTIONS:
DO NOT
SMOEIN THE WORK AREA.
DISPLAY 'NO SMOKING
' SIGNS AROUND THE AREA.
ENSURE THAT A
CO2 FIRE EXTINGUISHER IS CLOSE AT HAND.
ENSURE THAT DRY SAND
IS AVAILABLE TO SOAK UP ANY FUEL SPILLAGE.
EMPTY FUEL USING SUITABLE FIRE
PROOF EQUIPMENT INTO AN AUTHORIZED EXPLOSIOWROOF
CONTAINER.
DO NOT EMPTY FUEL
INTO A PIT.
ENSURE THAT WORKING AREA
IS WELL VENTILATED.
ENSURE THAT ANY WORK ON THE FUEL SYSTEM
IS ONLY CARRIED OUT BY EXPERIENCED AND WELL
QUALIFIED MAINTENANCE PERSONNEL.
The fuel filler assembly, supplied complete with serviceable lid, hinge and hinge spring, is fixed to the Body-in-White
(BIW) decking panel by two M5 nuts. Additional parts of the assembly comprise a adjustable rubber buffer, a snap-in
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The connectors are released by pushing the tool in to the female half of theconnector and at the sametime disengaging
the latches.
Viton hosing surrounds the tubing, thus preventing any po
-
tential damage from fire and other matters.
The conductive anti
-permeation tubing does not return to
its original shape after being deformed. Therefore do not
clamp
(eg. for sealing purposes prior to disconnection of
tubes) as this damages the fuel pipes.
The evaporative
loss control system prevents unprocessed
vapour emitted from the fuel tank from entering the atmos
- phere.
A running-loss control valve (4.0 liter NAS markets only) or
a tank pressure control (Rochester) valve (wherefitted) is in- stalled between the fuel tank and the carbon canister.
Both valves are normally closed, but open during engine
operation. They vent vapours from the fuel tank to the car
- bon canisterb).
On filling up the tank the fuel produces positive pressure in- side the tank which causes only the running loss valve to
close, blocking off the vent line. The Rochester valve is
closed when the engine is off.
The purge valve is controlled by the engine control module (ECM) and is linked to the carbon canister.
I Jl9-LM
Fig. 1 Quick-fit connector and release tool
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Fuel, Emission Control & Engine Management (AJ16)
5.1.3
SRO 19.60.13 FUEL RAIL
SRO 19.45.11 REGULATOR VALVE
SRO 18.10.01 INJECTORS
SRO 18.10.02 INJECTORS (VEHICLE SET)
FUEL
RAIL /PRESSURE REGULATOR VALVE/ INJECTORS (SUPERCHARGED), RENEW
Fig. 1
Remove
. Reposition top edge of trunk front liner for access.
. Disconnect multi-plug from evaporative loss flange inset (Fig. 1 ).
. Switch ignition on.
. Switch ignition off.
. Disconnect earth lead eyelet (1 Fig.1) from inlet manifold stud.
. Disconnect engine harness to oxygen sensor leads multi-plug.
. Disconnect engine harness to starter motor solenoid link lead multi-plug.
. Undo fuel injector multi-plug cover fixings (2 Fig.1).
. Disconnect cover from injectors (3 Fig.1).
Crank engine to depressurize fuel system.
Disconnect
battery,see Section 15.
Undo fuel rail to feed pipe union nut
(4 Fig.1).
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Fuel, Emission Control & Engine Management (AJ16)
. Reposition fuel feed pipe from fuel rail union and fit blanking plugs to rail and pipe.
. Undo and remove regulator mounting bracket to inlet manifold bracket securing bolt (5 Fig.1).
. Undo fuel rail to regulator union nut.
. Reposition regulator from fuel rail union and fit blanking plugs.
. Remove fuel rail assembly (1 Fig.1) from manifold.
Undo
and remove fuel rail securing bolts.
Fig. 1
Fit blanking plugs to manifold.
. Drain the residual fuel from the fuel rail into a suitable drain tin.
. Remove the injector retaining clips (2 Fig.1).
. Remove injectors (3 Fig. 1 ).
Disconnect vacuum hose from regulator.
. Remove regulator mounting bracket.
. Undo fuel rail to regulator union nut.
= Remove regulator assembly.
Refit in the reverse order of the removal procedure.
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Fuel, Emission Control & Engine Management (AJ16)
5.1.4
SRO 19.60.13
FUEL RAIL /PRESSURE REGULATOR VALVE/ INJECTORS (NORMALLY ASPIRATED ENGINE),
SRO 19.45.11
SRO 18.10.01 INJECTORS
SRO 18.10.02 INIECTORS (VEHICLE SET)
IB
RENEW
Fig. 1
Remove
. Reposition top edge of trunk front liner for access.
. Disconnect multi-plug from evaporative loss flange inset (Fig.1).
. Switch ignition on.
. Crank engine to depressurize fuel system.
. Switch ignition off.
. Disconnect battery, see Section 15.
. Disconnect earth lead eyelet (1 Fig.1) from inlet manifold stud.
. Disconnect engine harness to oxygen sensor leads multi-plug.
. Disconnect engine harness to starter motor solenoid link lead multi-plug.
. Undo fuel injector multi-plug cover fixings (2 Fig.1).
. Disconnect cover from injectors (3 Fig.1).
. Undo fuel rail to feed pipe union nut (4 Fig.1).
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Fuel, Emission Control & Engine Management (AJ16)
. Reposition fuel feed pipe from fuel rail union and fit blanking plugs to rail and pipe.
Undo and remove regulator mounting bracket to inlet manifold bracket securing bolt (5 Fig.1).
. Undo fuel rail to regulator union nut.
. Reposition regulator from fuel rail union and fit blanking plugs.
/ 119 L66
Fig. 1
. Undo and remove fuel rail securing bolts.
. Remove fuel rail assembly (1 Fig.1) from manifold.
Fit blanking plugs to manifold.
. Drain the residual fuel from the fuel rail into a suitable drain tin.
Remove the injector retaining clips (2 Fig.1).
. Remove injectors (3 Fig.1).
. Disconnect vacuum hose from regulator.
. Remove regulator mounting bracket.
. Undo fuel rail to regulator union nut.
Remove regulator assembly.
Refit in the reverse order of the removal procedure.
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Fuel, Emission Control & Engine Management (AJ16)
5.1.6 THROTTLE ASSEMBLY (SUPERCHARGED), RENEW
SRO 18.30.17 THROTTLE POTENTIOMETER
SRO 19.70.07 THROTTLE HOUSING GASKET
SRO 19.70.04 THROTTLE HOUSING
J 12-62 2
Fig. 1
Remove
. Disconnect battery.
. Remove the intercooler intake elbow.
. Raise vehicle on a four-post ramp.
. Remove the rear air duct to throttle body connecting hose.
Undo and remove bolts securing EGR supply pipe to manifold.
Remove EGR supply pipe gasket.
Reposition EGR sensor harness multi-plug from mounting bracket.
. Release throttle outer cable abutment from abutment bracket.
. Disconnect throttle inner cable from throttle linkage.
. Disconnect and remove return spring.
. Disconnect speed control actuator vacuum hose.
. Release cooling system pressure by slowly undoing the tank cap.
Tighten cap after pressure release.
. Remove abutment bracket assembly.
Disconnect idle speed actuator harness multi
-plug.
. Disconnect throttle potentiometer harness multi-plug.
. Fit pipe clamps to throttle housing cooling hoses and disconnect hoses from throttle housing.
Remove
the oil filter cartridge and gasket.
Remove speed control speed control bracket to throttle lever clevis pin and pin
circlip.
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Fuel, Emission Control & Engine Management (AJ16)
5.1.8
SRO
SRO IDLE
SPEED CONTROL VALVE/ GASKETS (NORMALLY ASPIRATED), RENEW
18.30.74 IDLE SPEED CONTROL VALVE
18.30.77 IDLE SPEED CONTROL VALVE GASKET
Remove
. Disconnect battery.
9 Remove the intake elbow to throttle housing hose.
Disconnect idle speed control valve multi-plug.
. Disconnect throttle potentiometer multi-plug.
. Remove clevis pin circlip.
. Reposition link arm from quadrant.
. Disconnect kick down cable (where fitted) from quadrant.
Open throttle fully and disconnect inner cable from quad-
Carefully release throttle against stop.
rant.
Fit pipe clamps
to throttle body heater feed and return
hose.
Disconnect feed hose from throttle body stub pipe.
rn Remove throttle body assembly from inlet manifold.
Remove idle speed control valve from throttle body.
. Remove gasket.
. Retrieve distance piece from throttle body recess. Fig.
1
Refit in the
reverse order of the removal procedure.
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SECTION CONTENTS
Subsection Title SRO Page
i .... .... . .... .. . PreliminaryPages ................. ......... .. . . .. . . . . .............. ....... ....... .. . . i
5.2.1 . . . . . . . . . . . . . Fuel System Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
5.2.2.. . . . . . . . . . . . General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5.2.3
. . . . . . . . . . . . . Fuel Rail / Pressure Regulator / Injectors, Renew . . . . . . . . . . . . . . . . . . . . 18.10.01
18.10.02
18.10.04
18.10.05
19.45.11
19.60.13
............. 5
5.2.4..
. . . . . . . . . . . Purge Control Valve, Renew . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.15.42
17.15.43
17.15.44
..... .. . . . . . . 8
5.2.5.
. . . . . . . . . . . . Idle Speed Control Valve/Gaskets, Renew . . . . . . . . . . . . . . . . . . . . . . . . . 18.30.72
18.30.73
18.30.74
18.30.75
18.30.76 ............. 9
5.2.6. . . . . . . . . . . . . Fuel Cut-off Inertia Switch, Renew.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.30.35 . . . . . . . . . . . . . 9
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Fig. 1 Fuel System Layout
119 L62
The above schematic illustration (Fig. I), shows the part and component layout of the fuel system and is to be read with
the table on Page 2.
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