renew the fuel filter (see Chapter 1), then
check the pump by substituting a new one,
and recheck the pressure. If the pressure
does not improve, the fault is in the pressure
regulator, and the complete injector housing
assembly must be renewed; if this is the case,
it is worth dismantling the regulator first to
check that the fault is not due to its being
jammed open with dirt, or similar.
8 Fuel tank - removal and
refitting
2
Note: Observe the precautions in Section 1
before working on any component in the fuel
system.
Removal
1 Before the tank can be removed, it must be
drained of as much fuel as possible. To avoid
the dangers and complications of fuel
handling and storage, it is advisable to carry
out this operation with the tank almost empty.
Any fuel remaining can be drained as follows.
2 Disconnect the battery negative lead.
3 Using a hand pump or syphon inserted
through the filler neck, remove any remaining
fuel from the bottom of the tank. Do this in a
well ventilated area, not in a garage or over an
inspection pit
4 Remove the luggage compartment carpet
and the spare wheel.
5 Release the two retaining studs, and
remove the trim panel from the side of the fuel
tank.
6 Disconnect the wiring connectors from the
fuel gauge sender unit.
7 Release the retaining clip, and disconnect
the vent pipe from the fuel tank.
8 Bearing in mind the information contained
in Section 6 on depressurising the fuel
system, release the retaining clips and
disconnect the fuel feed and return hoses
from the tank; the feed hose is marked with a
yellow band, and the return hose is unmarked.
9 Undo the fuel tank strap retaining bolt, then
remove the strengthening plate and move the
strap to one side.
10 Release the fuel tank filler neck from its
grommet, and remove the grommet from the
car.
11 Peel back the rubber cover, then
disconnect the wiring connector from the fuel
pump, and remove the fuel tank from the
vehicle.
Refitting
12 Refitting is the reverse sequence to
removal, ensuring that all hoses are correctly
reconnected and securely fastened so that
there can be no risk of fuel leakage.
9 Fuel pump - removal and
refitting
2
Note: Observe the precautions in Section 1
before working on any component in the fuel
system.
Removal
1 Remove the fuel tank as described in
Section 8.
2 Release the retaining clip, and disconnect
the two-way breather valve vent hose from
the fuel tank. Unclip the valve and hose
assembly from the tank seam, and remove it.
3 Slacken and remove the six fuel pump
retaining nuts, then carefully withdraw the
pump assembly from the tank, and remove
the pump seal.
Refitting
4 Examine the pump seal for signs of damage
or deterioration and, if necessary, renew it.
5 Ensure that the pump and tank mating
surfaces are clean and dry, and fit the seal
onto the fuel tank.
6 Carefully install the pump assembly, then
refit the pump retaining nuts and tighten them
to the specified torque.
7 Clip the two-way valve and hose assembly
back onto the tank seam, then reconnect the
vent hose to the tank, securing it in position
with its retaining clip.
8 Refit the fuel tank as described in Section 8.
10 Fuel gauge sender unit -
removal and refitting
2
Refer to Part A, Section 8.
11 Unleaded petrol - general
information and usage
Note: The information given in this Chapter is
correct at the time of writing. If updated
information is thought to be required, check
with a Rover dealer. If travelling abroad,
consult one of the motoring organisations (or a
similar authority) for advice on the fuel
available.
All fuel injection models are designed to run
on fuel with a minimum octane rating of 95
(RON). All models are equipped with catalytic
converters, and therefore must be run on
unleaded fuel only. Under no circumstances
should leaded fuel be used, as this may
damage the catalytic converter.
Super unleaded petrol (97/98 RON) can
also be used in all models if wished, though
there is no advantage in doing so.
12 Fuel injection system -
testing and adjustment
3
Testing
1 If a fault appears in the fuel injection
system, first ensure that all the system wiring
connectors are securely connected and free
of corrosion. Ensure that the fault is not due to
poor maintenance; ie, check that the air
cleaner filter element is clean, the spark plugs
are in good condition and correctly gapped,
the valve clearances are correctly adjusted,
the cylinder compression pressures are
correct, and that the engine breather hoses
are clear and undamaged, referring to
Chapters 1 and 2 for further information.
2 If these checks fail to reveal the cause of
the problem, the vehicle should be taken to a
suitably-equipped Rover dealer for testing. A
wiring block connector is incorporated in the
engine management circuit, into which a
special electronic diagnostic tester can be
plugged. The tester will locate the fault quickly
and simply, alleviating the need to test all the
system components individually, which is a
time-consuming operation that also carries a
risk of damaging the ECU.
Adjustment
3 Experienced home mechanics with a
considerable amount of skill and equipment
(including a tachometer and an accurately
calibrated exhaust gas analyser) may be able
to check the exhaust CO level and the idle
speed. However, if these are found to be in
need of adjustment, the car must be taken to
a suitably-equipped Rover dealer for further
testing. Note: There is no provision for the
adjustment or alteration of these settings,
except by reprogramming the ECU using
Rover diagnostic equipment; if checking the
idle speed, remember that it will vary
constantly under ECU control.
13 Fuel injection system
components - removal and
refitting
3
Throttle body
Note: Refer to the warning note in Section 1
before proceeding.
Removal
1 Remove the air cleaner assembly, as
described in Section 2.
2 Slacken and remove the bolt and retaining
clip securing the fuel pipes to the bulkhead
(see illustration). Examine the injector
housing fuel pipe feed and return unions for
signs of leakage, then wipe them clean.
3 Bearing in mind the information contained
in Section 6 on depressurising the fuel
system, using an open-ended spanner to hold
Fuel system - fuel injection engines 4B•5
4B
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