2002 LAND ROVER DISCOVERY fuel

FUEL DELIVERY SYSTEM - V8
DESCRIPTION AND OPERATION 19-2-9
Injectors
1'O' ring 2 off
2Electrical connector
3Steel housing
4Filter strainer
5Spring6Valve needle and armature
7Valve seat/spray orifice
8Plastic housing
9Solenoid winding
An injector for each cylinder is mounted externally in the lower inlet manifold on the engine. The injector protrudes
into the inlet manifold tract, where it releases a controlled delivery of fuel into the manifold air inlet.
Each injector is sealed to the fuel rail and the inlet manifold with 'O' rings. Spring clips retain each injector to the fuel
rail and the attachment of the fuel rail clamps the injectors in the lower manifold.
The injector housing is manufactured from plastic which encapsulates a high-alloy steel housing. The steel housing
contains all components which come into contact with fuel. The plastic housing also provides the attachment for the
engine harness connector for the injector. A solenoid is located between the two housings and moves a valve needle
via an armature. The valve needle seats on a valve seat which incorporates a spray orifice plate. A filter strainer is
fitted at the connection with the fuel rail to remove any particulate matter from the fuel before it enters the injector.
When the ECM energises the solenoid, the armature moves lifting the valve needle off its seat. This allows
pressurised fuel from the fuel rail to pass through the injector housing and needle to the spray orifice. The spray orifice
controls the spray shape and fuel metering. When the solenoid is de-energised, the valve needle returns to the valve
seat, aided by a spring, closing off the injection of fuel into the inlet.
Each injector receives a battery supply voltage via a fuse in the engine compartment fusebox. The fuel delivery timing
is controlled by the ECM, which, at a precisely timed interval, provides a ground path for the injector. The completion
of the ground path operates the injector to allow fuel at pump pressure to be delivered from the fuel rail to the injector
nozzle. Each injector sprays a finely atomized spray of fuel into the inlet, where it is mixed with the intake air prior to
combustion.

+ ENGINE MANAGEMENT SYSTEM - V8, DESCRIPTION AND OPERATION, Description - engine
management.
Faults for each injector are stored in the ECM and can be retrieved using TestBook. Each injector can be checked
across the two connector pins. For a correctly functioning injector a resistance of between 13.8 and 15.2 ohms at a
temperature of 20
°C (65°F) should be read across the pins.

FUEL DELIVERY SYSTEM - V8
19-2-10 DESCRIPTION AND OPERATION
Operation
When the ignition switch is moved to position II, the fuel pump relay in the engine compartment fusebox is energised
by the ECM. Battery voltage is supplied from the fuel pump relay to the fuel pump which operates. If engine cranking
is not detected by the ECU within a thirty second period, the ECU will 'time-out', de-energising the fuel pump relay.

+ ENGINE MANAGEMENT SYSTEM - V8, DESCRIPTION AND OPERATION, Description - engine
management.
The fuel pump draws fuel from the swirl pot and pumps it along the fuel feed pipe to the injector fuel rail on the engine.
When the pressure in the fuel feed line reaches 3.5 bar (50 lbf.in
2) the fuel pressure regulator opens and relieves
pressure by directing fuel back into the swirl pot. The pressure regulator is constantly opening and closing to maintain
the pressure in the fuel feed pipe and the fuel rail at 3.5 bar (50 lbf.in
2).
The pressure is felt at each of the eight injectors connected to the fuel rail. The ECM controls the injection timing and
energises each injector to allow a metered amount of fuel at pump pressure to be injected into the inlet tract of the
inlet manifold. The atomised fuel from the injector is mixed with air from the inlet manifold before passing into the
cylinder.

FUEL DELIVERY SYSTEM - V8
ADJUSTMENTS 19-2-11
ADJUST ME NTS
Fuel tank - drain
$% 19.55.02
Drain
1.Disconnect both leads from battery.
WARNING: Always disconnect the negative
lead first. Disconnection of the positive lead
while the negative lead is connected could
result in a short circuit through accidental
grounding and cause personal injury.
2.Connect TestBook to vehicle and depressurise
fuel system.
3.Remove fuel pump.

+ FUEL DELIVERY SYSTEM - V8,
REPAIRS, Pump - fuel.
4.Using a fuel recovery appliance, drain the fuel
from the tank into a sealed container. Follow
the manufacturers instructions for the
connection and safe use of the appliance.
Refill
1.Fit fuel pump unit.

+ FUEL DELIVERY SYSTEM - V8,
REPAIRS, Pump - fuel.
2.Refill fuel tank with extracted fuel.
3.Connect battery leads, positive lead first.

FUEL DELIVERY SYSTEM - V8
19-2-12 ADJUSTMENTS

FUEL DELIVERY SYSTEM - V8
REPAIRS 19-2-13
REPAIRS
Switch - inertia - fuel cut-off
$% 19.22.09
Remove
1.Disconnect multiplug from fuel cut-off switch.
2.Remove 2 screws securing fuel cut-off switch to
bulkhead.
3.Remove fuel cut-off switch from bulkhead.
Refit
1.Position fuel cut-off switch to bulkhead and
secure with screws.
2.Connect multiplug to fuel cut-off switch.
3.To set the fuel cut-off switch, depress the top of
the fuel cut-off switch.
Pump - fuel
$% 19.45.08
NOTE: The fuel pump and fuel gauge tank unit are
integral parts of the fuel pump housing and cannot be
renewed separately
Remove
1.Release fixings and remove battery cover.
2.Disconnect battery earth lead.
3. Models with third row seats: Remove RH
third row seat.

+ SEATS, REPAIRS, Seat - third row.
4.Remove 5 trim clips securing lower edge of RH
'D' post trim casing.
5. Models with rear ICE controls: Remove
screw securing remote ICE controls to RH side
trim casing.
6. Models with rear ICE controls: Release ICE
controls from RH side trim casing. Disconnect
multiplug and remove ICE controls.
7.Partially remove tail door aperture seal in the
area of the RH side trim casing.

FUEL DELIVERY SYSTEM - V8
19-2-14 REPAIRS
8.Remove 2 trim clips securing RH side trim
casing to body.
9.Remove rear lamp access panel from RH side
trim casing.
10.Remove trim clip securing RH side trim casing
to lower 'E' post.
11. Models with third row seats: Remove bolt
securing lower mounting of third row seat belt to
body.
12.Remove RH side trim casing.
13.Pull back loadspace carpet from fuel pump
access panel.
14.Remove 6 screws securing access panel.
15.Remove access panel.
16.Disconnect multiplug and fuel hose from fuel
pump housing.
CAUTION: Always fit plugs to open
connections to prevent contamination.
17. NAS models: Disconnect pressure sensor
pipe from fuel pump housing.
CAUTION: Always fit plugs to open
connections to prevent contamination.18.Use LRT-19-009 to remove locking ring from
fuel pump housing.
19.Remove fuel pump housing.
20.Remove and discard sealing ring from fuel
pump housing.
Refit
1.Clean fuel pump housing and mating face on
fuel tank.
2.Fit new seal to mating face on fuel tank.
3.Fit fuel pump housing to fuel tank and use LRT-
19-009 to fit locking ring.
4.Connect multiplug and fuel hose to fuel pump
housing.
5. NAS models: Connect pressure sensor pipe to
fuel pump housing.
6.Fit access panel and secure with screws.
7.Reposition loadspace carpet.
8.Fit RH side trim casing.
9. Models with third row seats: Fit bolt securing
lower mounting of third row seat belt to body
and tighten to 50 Nm (37 lbf.ft).
10.Fit trim clip securing RH side trim casing to
lower 'E' post.
11.Fit rear lamp access panel to RH side trim
casing.
12.Fit trim clips securing RH side trim casing to
body.
13.Fit tail door aperture seal.
14. Models with rear ICE controls: Connect
multiplug to remote ICE controls.
15. Models with rear ICE controls: Fit ICE
controls to RH side trim casing and secure with
screw.
16.Fit trim clips securing lower edge of RH 'D' post
trim casing to body.
17. Models with third row seats: Fit RH third row
seat.

+ SEATS, REPAIRS, Seat - third row.
18.Connect battery earth lead.
19.Fit battery cover and secure with fixings.

FUEL DELIVERY SYSTEM - V8
REPAIRS 19-2-15
Tank - fuel
$% 19.55.01
Remove
1.Drain fuel tank.

+ FUEL DELIVERY SYSTEM - V8,
ADJUSTMENTS, Fuel tank - drain.
2.Raise rear of vehicle.
WARNING: Do not work on or under a
vehicle supported only by a jack. Always
support the vehicle on safety stands.
3. All except NAS models:Release clips
securing filler and breather hoses. Release
hoses from filler tube.
4. NAS models: Loosen securing clip and
release filler tube from fuel tank.
5.Disconnect fuel tank vent pipe from filler tube.
6.Support weight of fuel tank underneath cradle. 7.Remove 2 nuts and 2 bolts securing cradle to
chassis.
8.With assistance, lower LH side of fuel tank then
remove fuel tank from chassis.
9.Remove cradle from fuel tank.
Non NAS fuel tank
10.Remove 2 scrivets securing heat shield and
remove heat shield.
11. All except NAS models: Release securing clip
and remove breather hose from fuel tank.
Refit
1.Fit breather hose to fuel tank and secure with
clip.
2.Position heat shield and secure with scrivets.
3.With assistance, position fuel tank and cradle.
4.Fit nuts and bolts securing cradle to chassis.
Tighten bolts to 45 Nm (33 lbf.ft) and nuts to 26
Nm (19 lbf.ft).
5.Connect vent hose.
6.Connect breather and filler hoses and secure
with clips.

FUEL DELIVERY SYSTEM - V8
19-2-16 REPAIRS
Filler tube - fuel
$% 19.55.07
Remove
1.Raise rear of vehicle.
WARNING: Do not work on or under a
vehicle supported only by a jack. Always
support the vehicle on safety stands.
2.Ensure fuel tank is less than half full. If not,
drain fuel tank to less than half full.

+ FUEL DELIVERY SYSTEM - V8,
ADJUSTMENTS, Fuel tank - drain.
3.Remove filler cap.
Non NAS installation
4.Drill out rivet securing lower part of mud flap
support bracket and release bracket .
5. All except NAS models: Disconnect filler
hose, breather hose and vent pipe from filler
tube.
NAS installation
6. NAS models: Loosen securing clip and
release filler tube from fuel tank.7. NAS models: Disconnect vent pipes from filler
tube.
8. Release filler tube from grommet in body and
remove from under rear wing. Collect grommet.
9. NAS models: Remove cable tie securing
pressure sensor pipe to filler tube and remove
filler tube.
Refit
1. NAS models: Position filler tube to pressure
sensor pipe and secure with new cable tie.
2. Fit grommet to body, position filler tube under
rear wing and secure in grommet.
3. NAS models: Connect filler tube to fuel tank
and secure with clip. Connect vent pipes to filler
tube.
4. All except NAS models: Connect filler hose
and breather hose to filler tube and secure with
clips. Connect vent pipe to filler tube.
5. Position support bracket to mud flap and
secure with new rivet.
6.If applicable, refill fuel tank with extracted fuel.
7.Fit filler cap.
8.Remove stand(s) and lower vehicle.