Fiat 1998 Marea Weekend, Service Manual

Page: 410 / 846

Engine
Fuel system
Marea- Marea Weekend ® ™
99 range
1. Impeller
2. Volumes
3. Inlet port
4. Supply port
5. Rollers
6. Outer seal
7. Excess pressure valve
IMMERSED (AUXILIARY) ELECTRIC FUEL
PUMP ASSEMBLY AND GAUGE
The assembly basically consists of:
- a roller type electric pump;
- a fuel gauge;
- a fuel filter
The electric pump immersed in the fuel is the
volumetric roller type with a motor with perma-
nently energized magnets.
The impeller (1) rotates, driven by the electric
motor, creating volumes (2) which move from
the inlet port (3) to the supply port (4).
These volumes are defined by rollers (5) which
adhere to the outer seal (6) during the rotation
of the motor.
The electric pump has two valves: one single-
acting valve to prevent the fuel circuit draining
(when the pump is not working); the second
excess pressure valve (7) which recirculates the
supply with the inlet when pressures in excess
of 5 bar are created.
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) consisting of a pack of paper discs
with a filtering surface of about 5300 cm 2 and
a filtering degree of 4 - 5 mm.
The filter is equipped with a fuel pre-heating de-
vice (2) operated by a thermal switch (3) fitted
on the actual 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.
A plug (4) for draining the water is bolted to the
base of the fuel filter cartridge.
1. Filter cartridge
2. Diesel pre-heating device
3. Thermal switch
4. Water drain plug
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