Fiat Bravo Service Manual page 376

Bravo
!
SPi
20v
Engine
Fuel system
10.
FUEL FILTER (A.450.024.262)
The fuel filter is fitted under the floor panel, on the fuel supply pipe. For the removing-refitting proce­
dure, refer to the fuel system section for the 1581 16v engine.
FUEL SUPPLY M A N I F O L D AND PRESSURE REGULATOR
The fuel supply manifold, which has the function of distributing the fuel to the injectors, is made from
steel and is equipped with housings for the injectors and for the pressure regulator and the fuel inlet and
outlet unions.
The fuel manifold is fixed to the inlet manifold by four brackets.
The pressure regulator is a necessary element in keeping the rise in pressure at the injectors constant.
It is a differential diaphragm type device, regulated at a pressure of around 3 bar.
The pressure regulator is made up of a metal casing which houses a moving element comprising a metal
casing (8) and a diaphragm (4) loaded by a spring (5). When the pre-set force, made up of the vacuum
in the opposite part of the diaphragm and the spring (5) loading, is exceeded, the fuel thrust by the
pump causes the opening of a valve (7) which allows the excess fuel to flow through the pipe to the
tank (2).
The chamber housing the spring is in contact with the engine inlet manifold (6) (vacumm signal). The
difference between the pressure of the fuel and the vacuum in the inlet manifold is kept constant for all
engine operating conditions.
Longitudinal section of fuel supply manifold and pressure regulator
1. Fuel return union
2. Fuel arrival union
3. Injectors mounting and fuel manifold
4. Diaphragm with flow valve
5. Adjustment spring
6. Connection to inlet manifold
7. Flow valve
8. Metal casing
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