Fuel distributor manifold

FUEL DISTRIBUTOR MANIFOLD

This device is die-cast and incorporates the pressure regulator and the injectors fastened on the manifold itself by special catches.

The fuel returns to the tank through a pipe contained inside the manifold connected to the fuel pressure regulator.

1. Fuel distributor manifold
2. Electroinjectors
3. Pressure regulator
4. Excess fuel return pipe

NOTE: Never wash the fuel distributor manifold with aggressive fluids, this operation may only be carried out on the outside using a brush. Otherwise, damage may occur to the seals (O-rings) and to the return circuit plastic piping.

REMOVAL/REFITTING

• Disconnect the battery (-) terminal.

1. Disconnect the electrical connection from the timing variator electromagnet.
2. Disconnect the electrical connection from the injectors, then move aside the wiring after removing the cover.
3. Disconnect the vacuum takeoff pipe from the pressure regulator.
4. Disconnect the fuel return and delivery pipes from the distributor manifold.

ELECTROINJECTORS

The electroinjectors are installed on a new aluminium distributor manifold which on one side incorporates the pressure regulator.

The injector nozzle is formed so that the jet of fuel atomizes into a 30° cone.

The injectors are locked by the fuel distributor which presses them into their housings machined on the intake ducts.

The injectors are also anchored to the fuel distributor by "safety catches" and sealed by two O-Rings.

The electroinjectors have the task of metering the amount of fuel needed by the engine.

They are "ON-OFF" devices i.e. they only have two possible conditions, either open or closed.

They will let the fuel pass when they are "open" and prevent it from being delivered when they are "closed".

They basically comprise a nozzle controlled by an electromagnet and by a return spring.

In the rest position, the needle, which forms one piece with the core, is pushed by the spring onto the electroinjector nose to close the hole and ensure that unwanted fuel is unable to come out.

As soon as the winding is energized, the core is attracted, it compresses the spring opening the nozzle hole, thereby allowing the fuel to flow out.

1. Slacken the two fastening screws and remove the fuel distributor manifold complete with injectors and pressure regulator and, if necessary, separate them on the bench.