Pressure Pump; Pressure Regulator Sensor - Fiat Bravo/Brava Workshop Manual

Engine
Fuel feed system
7-^e,
Bravo- Btava W*
m
2000 range
PRESSURE P U M P
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
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Print n° 506.670/22