Removal/refitting

The fuel pressure regulator keeps the difference in fuel pressure and the pressure in the intake manifold at a constant level. In this way it is possible to meter the amount of fuel on the basis of the opening times of the electroinjectors only.

The pressure regulator is mounted at one end of the fuel separator pipe. It is a limiting regulator controlled by a diaphragm which regulates the fuel pressure to 3 bars. When the pressure of the fuel exceeds the maximum value the diaphragm acts on a valve which opens the return piping through which the excess fuel is returned to the tank.

A small pipe connects the regulator spring chamber to the intake box downstream of the throttle valves. An interdependence is created by this tube between the pressure in the fuel system and the pressure in the intake box so that the pressure between inlet and outlet of the electroinjectors when open, is always the same.

1. Valve
2. Body holding valve
3. Diaphragm
4. Spring

REMOVAL/REFITTING

1. Disconnect the fuel return pipe from the pressure regulator.
2. Disconnect the vacuum intake pipe from the from the regulator.
3. Unscrew the two retaining screws and remove the regulator from the supply manifold.