Fuel Drip Tray Assembly; Fuel Filter; Fuel Pressure Regulator - Fiat 1998 Marea Service Manual

Engine
Fuel system
10.
1. Electric fuel pump

2. Fuel filter

3. Gauge with float
4. Pressure regulator
5. Gauze pre-filter
32
Marea- Marea Weekend ®
FUEL DRIP TRAY
ASSEMBLY
Electric fuel pump
The pump is housed inside the fuel tank on a
special drip tray which also supports the gauge
and is equipped with a filter on the pump inlet.
The pressure regulator is also 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 driven by a direct current electric
motor supplied by a relay, operated by the
control unit to ensure:
- that the pump cuts out if the engine speed
goes below a minimum level;
- the timed operation (about 5 seconds) each
time the ignition is switched ON, even if the
engine is not started up;
4F032PJ01
- operation when the engine is started' up.
The pump is equipped with an excess pressure
valve which short circuits the supply with the
inlet if the pressure in the supply circuit ex-
ceeds about 5 bar, to prevent the electric mo-
tor from overheating.
In addition, a single-acting valve, fitted on the
supply, prevents the entire fuel circuit from
draining when the pump is not working.
Fuel filter
The fuel filter is housed in the casing sur-
rounding the pump and does not need to be
replaced periodically.
Fuel pressure regulaor
This is a differential diaphragm device, ad-
justed during manufacture, to a pressure of
3.50±0.05 bar and it is located in the top part
of the drip tray.
The fuel under pressure (1), coming from the
pump, exerts a force on the flow valve (3) op-
posed by the calibrated spring (2). When the
calibration pressure is exceeded, the flow valve
opens and the excess fuel (4) returns to the
tank, thereby stabilizing the pressure in the cir-
cuit.
99 range
Print n° 506.763/14