MV Agusta Brutale 675 Workshop Manual page 162

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 3,5 kg/cm (350 kPa).
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When the pressure of the fuel rises above 3,5 kg/cm (350 kPa) the excess fuel opens the valve of the regulator
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and therefore can return to the fuel tank.
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