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FUEL SYSTEM
4.1.1 MAINTENANCE
Check the conditions of the fuel system pipes every
6000 km or 8 months. Change the pipes that show signs
of drying, cracks or cuts.
Make sure that the pipes are NEITHER twisted, NOR
throttled in any point.
Periodically check and clean the fuel pump filter, see
4.2.1 (REMOVING THE PUMP UNIT).
4.1.2 CHECKING THE FUEL SUPPLY
Carefully read 1.4 (PRECAUTIONS AND GENERAL IN-
FORMATION) and 1.2.1 (FUEL).
a
Fuel vapours are noxious for the health.
Before proceeding, make sure that the room
in which you are working is properly ventilat-
ed. Do not inhale fuel vapours.
Avoid any contact of the fuel with the skin.
Neither smoke, nor use free flames.
Do not dispose of fuel in the environment.
Position the vehicle on the stand.
Make sure that there is fuel in the fuel tank.
Remove the left inspection cover, see 7.1.2 (REMO-
VING THE RIGHT AND LEFT INSPECTION CO-
VERS).
Put a container with about 1
vehicle, in order to use it to collect the fuel.
a
Proceed with care. Provide for the collection
of the fuel that will flow out of the fuel feed
pipe (1), when this is disconnected.
Bend the fuel feed pipe (1) with your fingers, thus throt-
tling it.
Disconnect the fuel feed pipe (1) from the carburettor.
Put the free end of the pipe inside the container.
Release the pipe and let the fuel flow into the container.
Move the ignition switch to position "
<r+>
l
capacity at the side of the
n
".
Let the starter run for a few seconds without accelerat-
ing and at the same time make sure that the fuel is
flowing out of the fuel feed pipe (1).
If the flow is irregular or if there is no flow at all, check the
integrity and the efficiency of the following components:
a
UPON REASSEMBLY, TAKE CARE NOT TO
INVERT THE PIPES.
Mark the pipes and the relevant couplings, in
order to be able to reassemble them correctly.
Make sure that the pipes are NEITHER twisted, NOR
throttled in any point.
Fuel feed pipe to carburettor (1).
Fuel header tank (2) (pipe coupling spouts clogged).
Fuel supply pipe (3).
a
Check the position of the one-way fuel valve
(4) and of the stabilizer jet (5) and reassemble
them correctly.
The direction of the arrow on the one-way fuel valve
(4) indicates the air flow, that must always be from
the fuel tank to the fuel header tank.
Make sure that the filler neck (Ø 3 mm), at the begin-
ning of the threading, is provided with a bleed and that
this is not clogged.
One-way fuel valve (4).
Fuel recovery pipes (7), stabilizer jet (5).
Pipe (8) and relevant fitting.
Vacuum pipe (9).
If the components are sound and efficient, proceed as fol-
lows:
Remove the fuel pump (10), see 4.2.1 (REMOVING
THE PUMP UNIT).
Check the efficiency of the fuel pump filter (11) and of
the connection pipe (12).
Check the integrity and the efficiency of the following
connection pipes: vacuum (13) and fuel delivery (14).
If also these operations should be unsuccessful, proceed
as follows:
Change the fuel pump (10), see 4.2.2 (DISASSEM-
BLING THE PUMP).
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