fuel pump LAND ROVER DISCOVERY 1995 Repair Manual

19FUEL SYSTEM
4
REPAIR MULTIPORT FUEL INJECTION RELAYS
Service repair no - 19.22.08
The two Multiport fuel injection relays are located in
the RH footwell area behind the 'A' post trim panel.
The fuel injection relays can be identified as follows:
A. Fuel pump relay - Blue base
B. Main relay - Black base
Remove
1.Release front door seal from 'A' post.
2.Remove lower 'A' post trim panel.
3.Pull relay from base.
Refit
4.Reverse removal procedure.ENGINE CONTROL MODULE (ECM)-14 CUX
Service repair no - 19.22.34
NOTE: The ECM is not serviceable, in
event of unit failure it must be replaced.
Remove
1.Remove the fascia right-hand closing panel.
2.Remove the right-hand footwell side panel trim.
3.Disconnect battery negative lead.
4.Release ECM plug retaining clip.
5.Maneouvre the front of the plug (in the direction
of the bold arrow) and detach the other end of
the plug from the retaining peg.
6.Release the two screws securing the ECM to the
right-hand footwell side panel.
7.Withdraw the ECM from the clip.
Refit
8.Refit the ECM securely in the clip and fit the two
screws.
9.Reconnect the ECM harness plug. Ensure that
the plug is pushed firmly into its location and that
the retaining clip secures the plug in position.
10.Reverse removal procedure.

19FUEL SYSTEM
6
REPAIR ENGINE COOLANT TEMPERATURE SENSOR
Service repair no - 19.22.18
Remove
1.Position drain tray to collect coolant spillage.
2.Disconnect multiplug from coolant sensor.
3.Remove sensor from thermostat housing.
4.Remove and discard copper washer.
Refit
5.Fit a new copper washer.
6.Fit sensor and tigten securely.
7.Top-up cooling system.
8.Run engine, check for water leaks around
sensor.DEPRESSURISING FUEL SYSTEM
WARNING: Under normal operating
conditions the Multiport fuel injection
system is pressurised by a high pressure
fuel pump, operating at up to 2.3 to 2.5 bar When
engine is stationary pressure is maintained within
system. To prevent pressurised fuel escaping and
to avoid personal injury it is necessary to
depressurise multiport fuel injection system
before any service operations are carried out.
If vehicle has not been run there will be a small
amount of residual pressure in fuel line. The
depressurising procedure must still be carried out
before disconnecting any component within the
fuel system.
The spilling of fuel is unavoidable during this
operation. Ensure that all necessary precautions
are taken to prevent fire and explosion.
1.Remove fuel pump relay module.
See
Multiport Fuel Injection Relays
2.Start and run engine.
3.When sufficient fuel has been used to cause fuel
line pressure to drop, injectors will become
inoperative, resulting in engine stall. Switch off
ignition.
4.Disconnect battery negative lead.
NOTE: Fuel at low pressure will remain in
system. To remove low pressure fuel,
place absorbent cloth around fuel feed
hose at fuel rail.
5.Disconnect either:
a) Nut and olive at fuel rail
OR
b) Hose at inlet end of fuel filter.
Refit
6.Refit fuel feed hose.
7.Refit fuel pump relay module, reconnect battery.
8.Crank engine (engine will fire in approximately 6
to 8 seconds).

MFI
17
REPAIR FUEL FILTER
Service repair no - 19.25.02
Remove
WARNING: Spilling of fuel is unavoidable
during this operation. Ensure all
necessary precautions are taken to
prevent fire and explosion.
WARNING: Ensure fuel handling
precautions given in Section 01 -
Introduction are strictly adhered to when
carrying out following instructions.
1.Depressurise fuel system.
See Depressurising
Fuel System
2.Access to filter is gained through right hand rear
wheel arch.
3.Clean area around hose connections to prevent
ingress of foreign matter into fuel system. Clamp
inlet and outlet hoses to prevent fuel spillage
when disconnecting hoses.
4.Loosen two fuel line unions and remove hoses.
Plug ends of hoses to prevent ingress of dirt.
5.Release securing bolt and bracket and remove
filter from chassis side member.
Refit
6.Fit a new filter observing direction of flow arrows
stamped on canister.
7.Tighten securing nut and bolt.
8.Fit inlet and outlet hoses. Tighten to
30Nm.
9.Refit fuel pump relay module, reconnect battery.
10.Start engine and inspect for fuel leaks around
hose connections.

19FUEL SYSTEM
18
REPAIR FUEL PIPES
Service repair no - 19.40.92
WARNING: Depressurise fuel system.See
Depressurise Fuel System
before
disconnecting any fuel pipes ensure that
all necessary precautions are taken against fuel
spillage
WARNING: Ensure fuel handling
precautions given in Section 01 -
introduction are strictly adhered to when
carrying out following instructions.
KEY
1. Fuel feed hose to fuel rail.
2. Fuel return hose to fuel tank.
3. Rigid fuel feed pipe.
4. Rigid fuel return pipe.
5. Fuel filter.6. Rigid fuel feed pipe to filter.
7. Breather hose.
8. In-tank fuel pump.
9. Fuel filler neck.
10. Fuel tank.

19FUEL SYSTEM
20
REPAIR ACCELERATOR PEDAL
Service repair no - 18.30.35
Remove
1.Remove lower dash panel.
2.Remove clevis pin securing throttle cable to
accelerator pedal.
3.Release tension from pedal return spring.
4.Remove circlip from pedal pivot pin.
5.Withdraw pivot pin.
NOTE: It may be necessary to lower
steering column to gain access to pivot
pin circlip.
6.Remove accelerator pedal.
Refit
7.Lightly grease pivot and clevis pins.
8.Fit clevis pin using aNEWcotter pin.
9.Reverse removal procedure.FUEL PUMP AND SENDER UNIT
Service repair no - 19.45.03
A plastic fuel tank with a combined fuel pump/sender
unit is fitted. The fuel pump/sender unit is accessed
through a panel in the load space floor.
Fuel pump/sender unit
WARNING: Ensure that fuel handling
precautions given in Section 01 -
Introduction are strictly adhered to when
carrying out following instructions.
CAUTION: Before disconnecting any part
of fuel system, it is imperative that all dust,
dirt and debris is removed from around
components to prevent ingress of foreign matter
into fuel system.
Service Tools:
LRT-19-001 wrench - pump retaining ring
LRT-19-002 'Speedfit' disconnector
Remove
1.Depressurise fuel system.
See Depressurising
Fuel System
2.Disconnect battery negative lead.
3.Syphon at least 9 litres (2 gallons) of fuel from
fuel tank into a suitable container that can be
sealed.
4.Remove carpet from loadspace floor and
tailgate.
5.Fold back loadspace sound insulation to reveal
access panel.

MFI
21
REPAIR 6.Remove access panel from floor.
7.Disconnect multi-plug from fuel sender unit.
8.Disconnect two fuel line unions from fuel pump.
9.Using service tool no. LRT-19-001, remove
pump unit retaining ring. Withdraw unit from fuel
tank.
WARNING: A quantity of fuel will be
retained in body of unit, care must be
taken to prevent fuel spillage when unit is
removed.
Refit
10.Insert fuel pump into tank. Fit retaining ring.
Tighten to
48 Nm.
11.Connect fuel lines to pump.
12.Connect multi-plug to sender unit.
13.After assembly, check all fuel pipes, sealing
rings and hose connections are secure.
14.Run engine to check for fuel leaks.
15.Inspect access panel seal, fit a new seal if
necessary.
16.Fit access panel and tighten screws.
17.Reverse removal procedure. 4 - 5. Fit insulation
and carpet.

19FUEL SYSTEM
22
REPAIR FUEL TANK
Service repair no - 19.55.01
WARNING: Ensure that fuel handling
precautions given in Section 01 -
introduction are strictly adhered to when
carrying out following instructions.
CAUTION: Before disconnecting any part
of fuel system, it is imperative that all dust,
dirt and debris is removed from around
components to prevent ingress of foreign matter
into fuel system.
Remove
1.Depressurise fuel system. Disconnect battery
negative lead.
2.Syphon fuel tank into a suitable container that
can be sealed afterwards.
ENSURE TANK IS DRAINED COMPLETELY.
(refer to Warning concerning fuel vapour and
spillage at start of procedure).
3.Remove carpet loadspace floor and tailgate.
4.Fold back sound insulation to reveal access
panel.
5.Remove access panel.
6.Disconnect electrical multi-plug.
7.Disconnect two fuel line unions from fuel pump.
8.Working underneath vehicle mark location of
anti-roll [sway] bar straps.
9.Remove rear anti-roll [sway] bar straps, and
allow bar to swing down clear of tank.
10.Remove tank filler and vent hoses at fuel tank.
11.Remove nut and bolt securing right hand side
fuel tank strap.
12.Disconnect evaporative control pipe at green
end of 'speedfit' connector.
NOTE: To disconnect 'speedfit' connector,
insert forked end of LRT-19-002 into slots
of connector see illustration. Press down
on collet and simultaneously pull pipe from
connector.

MFI
1
SERVICE TOOLS FUEL SYSTEM
LRT-19-004 Test equipment fuel pressure
18G 500
LRT-19-003 MFI pressure test adaptor
LST 143
LRT-19-002 Connector splitter
LST 144
LRT-19-001 Fuel pump remover
LST 131

19FUEL SYSTEM
2
DESCRIPTION AND OPERATION REV: 09/95 ENGINE MANAGEMENT SYSTEM COMPONENT
LOCATION - PRE ADVANCED EVAPS
1. Engine control module
2. Ignition coils
3. Fuel pressure regulator
4. Mass air flow sensor
5. Relay module
- Main relay
- Fuel pump relay
6. Engine coolant temperature sensor
7. Camshaft position sensor
8. Throttle position sensor

SFI
7
DESCRIPTION AND OPERATION REV: 09/95 Fuel pressure regulator
The fuel pressure regulator is located at the rear of
the engine in the fuel rail. It consists of a fuel inlet,
outlet, vacuum port and internal diaphragm.
When the engine is under high manifold depression,
the applied vacuum sucks the diaphragm of its seat,
allowing fuel to return to the tank, resulting in a lower
fuel pressure. This is necessary because the high
depression will try to suck the fuel from the injector,
resulting in overfuelling if the pressure remained
constant. Failure will result in a rich mixture at idle but
normal at full load, or a rich mixture resulting in engine
flooding, or a weak mixture. Although the fault will not
illuminate the MIL, faults caused by the failure may be
indicated.Relay module
The engine management system employs a relay
module, which houses the main relay and the fuel
pump relay.
Main relay
The main relay supplies the power feed to the ECM
with a tap off to feed the fuel injectors (8 amps) and
air flow sensor (4 amps). This relay is controlled by
the engine management ECM. This enables the ECM
to remain powered up after ignition is switched off.
During this 'ECM power down routine' the ECM
records all temperature readings and powers the
stepper motor to the fully open position. Failure of this
relay will result in the engine management ECM not
being switched on resulting in engine not starting due
to absence of fuel and ignition.
Fuel pump relay
The fuel pump relay is fed from the ignition relay and
controlled by the engine management ECM. The relay
is activated in ignition key position 2 to prime the fuel
system for a period of time controlled by the ECM.
Failure of this relay will result in no fuel pressure.
Inertia switch
The inertia switch isolates the power supply to the fuel
pump in the event of sudden deceleration. The inertia
switch is located in the engine compartment. It is reset
by depressing the central plunger at the top of the
switch.