Engine
Fuel feed system
7-^e,
Bravo-
Btava
W*
m
2000 range
PRESSURE PUMP
The pressure pump
is
radialjet type with three
radial pistons (total capacity 0.657
cc). It is
controlled
by a
timing belt with
or
without
timing requirements.
Each pump unit consists
of:
-
a
piston
(5)
opered
by a cam (2)
integral
with
the
pump shaft
(6);
-
a
plate-type intake valve
(3);
-
a
delivery ball valve
(4).
The pressure pump must
be
supplied
at a
pressure
of at
least
0.5
bars;
and for
this rea-
son
the
fuel system
is
equipped with
an
aux-
iliary pump submerged
in the
tank.
The pressure pump
is
lubricated
and
cooled
by
the
diesel fuel
via
channels
and is
able
to
deliver
a
maximum pressure
of 1350
bars.
1.
Cylinder
2.
Cam
3. Plate-type intake valve
4.
Ball-type delivery valve
5. Piston
6. Pump shaft
7. Diesel intake connection
- low
pressure
-
from fuel filter
8. Diesel delivery connection
-
high pressure
-
to manifold (rail)
9. Diesel delivery connection
- low
pressure
-
recirculation
PRESSURE REGULATOR
SENSOR
The fuel pressure regulator
is
fitted
to the
pressure pump
and
controlled directly
by the
injection control unit.
It
regulates fuel feed
pressure
to the
injectors.
The pressure regulator consists mainly
of the
following parts:
1.
Ball plunger
2.
Pin
3. Valve
4.
Preload spring
5. Coil
6. Body
7. Anchor
20
Print n° 506.670/22
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