Fuel Manifold - Fiat 1998 Marea Service Manual

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4F033PJ03
4F033PJ04

FUEL MANIFOLD

The fuel manifold, which has the task of dis-
tributing the fuel to the injectors, is made from
die-cast aluminium and incorporates the seats
for the injectors and the air bleed valve.
The fuel intake is achieved by means of a rapid
attachment. Since the system is the returnless
type, there is no recirculation pipe.
1. Fuel manifold
2. Injectors
3. Fuel arrival connector
4. Bleed valve
INJECTORS
The injector is designed to provide the quantity
of fuel needed for the operation of the engine:
the fuel is injected into the inlet manifold, im-
mediately upstream of the inlet valves.
The injector is the top-feed type, with the sup-
ply of fuel from the top part of the body where
the electrical winding connected to the con-
nector (3) terminals is also housed.
When the current flows through the winding,
the magnetic field which is created attracts the
shutter causing the opening of the injector and
the flow of fuel.
Two seals ensure the fuel manifold (1) side
seal and the inlet manifold side (2).
A reference (4) determines the angular posi-
tion of the injector and the correct direction of
the jets in relation to the inlet valves.
Connector wiring
The injector resistance can be measured by
disconnecting the connector and connecting
an ohmmeter as illustrated in the diagram.
Resistance value: 14.5 5%±ohm.
Engine
Fuel system
33