Fiat 1996 Brava Service Manual page 367

Engine
Fuel system
10.
1. Impeller
2. Volumes
3. Inlet port
4. Supply port
5. Rollers
6. Outer ring
7. Excess pressure valve
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IMMERSED (AUXILIARY) ELECTRIC PUMP
AND FUEL GAUGE
This assembly is basically composed of:
- a roller type electric pump;
- a fuel level gauge;
- a fuel filter
The electric pump immersed in the fuel is the
volumetric roller type with a motor with brushes
and permanent magnets.
The impeller (1), driven by the electric motor,
creates volumes (2) which move from the inlet
port (3) to the supply port (4).
These volumes are defined by rollers (5) which,
during the rotation of the motor, adhere to the
outside ring (6).
The electric pump has two valves: one sin­
gle-acting \£alve to preven the fuel circuit from
being drained (when the pump is not working);
the second excess pressure valve (7) which re­
circulates the supply with the inlet when the
pressure exceeds 5 bar.
FUEL FILTER
The fuel filter is located in the engine compart­
ment, fixed to the inlet manifold.
The filter is the cartridge type with a filter ele­
ment (1) made up of a pack of paper discs with
a filtering surface area of around 5300 cm
2
and
a filtering capacity of 4 - 5 mm.
The filter has a fuel pre-heating device (2) con­
trolled by a thermal switch (3) fitted on the ac­
tual filter.
When the temperature of the diesel is below 6
"C, an electrical resistance heats it up to a maxi­
mum of 15 °C before sending it to the pressure
pump.
There is a plug (4) bolted to the base of the fuel
filter cartridge for draining the water.
1. Filter cartridge
2. Diesel pre-heating device
3. Thermal switch
4. Water drain plug
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Print no. 506.670/16