Beretta L4-121 2.0L (1987)
Fuel Pressure Regulator: Description and Operation
Fuel Pressure Regulator Operation
PURPOSE
The function of the regulator is to maintain a constant pressure differential across the injectors at all times. The pressure regulator compensates for
engine load by increasing fuel pressure as engine vacuum drops.
OPERATION
The pressure regulator is a diaphragm-operated relief valve with engine vacuum on one side and and atmospheric pressure on the other side. The
function of the regulator is to maintain a constant pressure to the injectors at all times, by controlling the flow in the return line by means of a
calibrated bypass.
DIAGNOSTIC NOTES
The pressure regulator on this unit can be serviced separately. The system operates in an acceptable pressure range of 62 to 90 kPa (9 ti 13 psi).
