Fiat 1996 Brava Service Manual page 283

Engine
Fuel system
10.
Bravo-Brava gty 16v
98 range
FUEL DRIP TRAY
ASSEMBLY
Electric fuel pump
The pump is housed insde the fuel tank on a
special drip tray which also supports the fuel
gauge and it has a filter on the pump inlet.
The pressure regulator is fitted on the pump
supply.
The pump is the single stage peripheral flow
type and is designed to run on unleaded fuel.
The rotor is moved by a d.c. electric motor
supplied by a relay and controlled by the
control unit to ensure:
- that the pump cuts out if the engine speed
goes below a minimum level;
- timed operation (about 5 seconds) each
time the ignition key is turned to the ON
psition, even if the engine is not started up;
- operation with the engine started up.
1. Electric fuel pump
2. Fuel filter
3. Fuel gauge with float
4. Pressure regulator
5. Gauze pre-filter
The pump is fitted with an excess pressure
valve which short circuits the supply with the
inlet if the pressure in the supply circuit ex­
ceeds around 5 bar to prevent the electric
motor from overheating.
In addition, a one-way valve in the supply,
prevents the entire fuel circuit from being
drained when the pump is not working.
Fuel filter
The fuel filter is in the housing surrounding
the pump and does not require periodic re­
placement.
Fuel pressure regulator
This is a differential, diaphragm device, ad­
justed during manufacture to a pressure of
3.50±0.05 bar and located in the top part of
the drip tray.
The fuel, under pressure (1), coming from the
pump, exerts force on the valve (3), opposed
by the calibrated spring (2). When the set
pressure is overcome, the valve opens and the
excess fuel (4) returns to the tank, thereby sta­
bilizing the pressure in the circuit.
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Print no. 506.670/16