Fiat Bravo Service Manual page 186

Bravo-Brava
I ^ I * *
Engine
Fuel system
10.
ELECTRIC FUEL PUMP (Walbro-Marwal MSS071)
The pump is housed inside the fuel tank in a holder, together with the fuel level indicator. It is fitted with
a mesh filter on the pump intake.
The pump is volumetric type and designed to work with unleaded fuel.The rotor is turned by an electric
d.c. motor supplied at battery voltage directly through the dual relay, controlled in turn by the ECU.
The motor is submerged in the fuel in order to clean and cool the brushes and commutator.
The pump is fitted with a pressure relief valve, which short-circuits delivery to intake if inlet circuit pres­
sure exceeds 5 bar. This prevents the electric motor overheating.
A check valve fitted in the delivery line prevents the entire fuel circuit emptying when the pump is not
working.
Rated pump output varies according to angular rotor speed and hence supply voltage: it is about 140 l/h
at a voltage of 12 V. „
P4A39CJ01
1. Electrical connectors
2. Delivery port
3. Inlet port
4. Pressure relief valve
5. Check valve
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