MV Agusta F4 BRUTALE 750 ORO Workshop Manual page 155

Air intake injection system
Fuel pressure regulator
The fuel pressure regulator is a diaphragm pressure release valve that consists of a diaphragm, spring and valve.
It always maintains the pressure of the fuel sent to the injector at 3.0 kg/cm2 (300 kPa).
When the pressure of the fuel rises above 3.0 kg/cm2 (300 kPa) the excess fuel opens the valve of the regulator
and therefore can return to the fuel tank.
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