Fiat Bravo Service Manual page 375

Engine
Fuel system
10.
Bravo
!
SP
20v
ELECTRIC FUEL P U M P (0.580.453.408)
The submerged electric fuel pump is located inside the tank, housed in a mounting also containing the
fuel gauge.
The electric pump is the cell type with rollers, operated by an electric motor with permanent magnet
windings, immersed in the fuel.
A disc rotor (1) situated eccentrically in the pump casing contains the cells arranged along its circumfer­
ence and metal rollers (2) which are thrust by centrifugal force against the outer race with the effect of
ensuring the hydraulic seal.
Cross section of electric pump
3 2 5
Longitudinal section of electric pump
P4A24FJ01
The fuel flows in the empty housings and is compressed in the supply duct (3). A one-way valve (4)
prevents the supply pipe from being drained with the engine switched off.
An excess pressure valve (5) short circuits the supply in the inlet chamber (6) when the pressure ex­
ceeds 7.5 bar.
The electric pump starts to work when the ignition switch is turned to the starting position. When the
starting stage is over, the electric pump continues to operate with the switch in the ON position, unless
the engine speed goes below 225 rpm or the ignition switch is turned to the OFF position.
If the engine cuts out for any reason, with the ignition switch in the ON position, the operation of the
pump is automatically interrupted, thereby creating a safety condition.
Diagram showing longitudinal
cross section and external view of
electric fuel pump
NOTE For the positioning and the re-
moving-refitting procedures, refer
to the fuel system section for the
1581 16v engine.
24 Print no. 506.670