Submerged Fuel Pump Assembly And Level Gauge Control; Fuel Filter - Fiat Bravo/Brava Workshop Manual

Bravo- Brava 9
m
2000 range
4A019QJ01
1. Impeller
2. Volumes
3. Intake port
4. Outlet port
5. Rollers
6. Outer race
7. Pressure relief valve
4A019QJ02
Engine
Fuel feed system
10.
SUBMERGED FUEL P U M P ASSEMBLY
(AUXILIARY) A N D LEVEL GAUGE C O N ­
TROL
The assembly consists mainly of:
a roller-type fuel pump;
a fuel level gauge;
a fuel filter
The submerged fuel pump is volumetric type
with rollers and a motor with brushes and per­
manent magnet excitation.
Impeller (1) is driven by the electric motor to
turn and create volumes (2) that move from in­
take port (3) to outlet port (4).
These volumes are delimited by rollers (5) that
adhere to outer race(6) as the motor turns.
The pump is fitted with two valves: a check
valve to prevent the fuel circuit emptying (with
the pump off); a second pressure relief valve
(7) that short-circuits the outlet to the inlet
when pressures exceed 5 bars.
FUEL FILTER
The fuel filter is located in the engine bay.
The filter is cartridge type with a filter element
(1) made up of a pack of paper discs with a fil­
tering area of some 5300 cm 2 and a filter gauge
of 4 - 5 microns.
The filter is equipped with a fuel preheating de­
vice (2) controlled by the engine control unit via
a relay.
The control unit activates or deactivates the die-
sel filter on the basis of a diesel temperature sig­
nal sent by sensor (3) on the filter.
A plug (4) screwed to the base of the fuel filter
cartridge is used to drai off the water. The plug
incorporates a sensor for the detection of water
in the diesel filter connected to a warning light
on the instrument panel.
1. Filter cartridge
2. Diesel preheating device
3. Diesel temperature sensor
4. Water drain plug with sensor to detect pres­
ence of water in diesel filter
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