Chapter 5 – Fuel feed system
Service manual AJP PR3/PR4 5 - 5
Type-specific bolts:
oval head M6x12
Tightening torque:
10N.m (1,0Kgf.m)
Note:
Only use screws with the correct length
(M6x12) to avoid damaging the tank when
tightening the fuel tank to the rear frame and
the rear fender in the fuel tank.
An incorrect installation of fuel pipes can
cause possible engine malfunction.
! DANGER !
Fuel pipes must be properly positioned to
ensure that they never touch in the exhaust
or become pinched / crushed.
This contact can cut the pipes and cause a
fuel spill, which can lead to loss of
motorcycle control or cause the beginning of
a fire.
FUEL FILTER
The fuel filter (1) is mounted between the right
frame beam and the carburetor, under the
seat. It is only necessary to remove the filter
from the pipes to make the replacement.
It must be replaced when it is observed the
existence of dirt on the inside, because the
accumulation of any dirt may damage the
pump, restrict or block the flow of fuel causing
loss of power and irregular engine operation.
FUEL PUMP
The fuel pump which PR3 / PR4 works by
vacuum in the intake manifold created by the
passage of air drawn in by the engine.
This double membrane pump automatically
cuts the flow of fuel when the engine is
switched off. So the bike does not have
gasoline shut-off valve.
During refueling operations, it is very
important to ensure that do not pass into the
tank any impurities such as water or soil / mud
that may be accumulated next to the threaded
filler cap.
If impurities reach the inside of the fuel pump,
will damage the membranes / valves,
disabling the fuel pump.
The use of contaminated fuel will also
damage the fuel pump.
In case of any malfunction of the fuel pump, it
should be replaced as a complete set.
Note:
Despite not being available any parts /
components to repair the fuel pump, it can be
dismantled for cleaning purposes.
Removal
Remove the seat and side covers (see
Chapter 2);
Remove the air filter housing (see page 5 –
4);
Remove the three connection pipes of pump,
the inlet, the outlet and the vacuum;
