Differential Pressure Regulator
Differential Pressure Regulator (DPR) is mounted on side of fuel distributor. An electrically operated plate valve combined with fixed outlet orifice, governs pressure in lower chamber. See Fig 1 . Pressure change in lower chamber causes movement of diaphragm and controls fuel volume flow to injectors.
Actuating signal comes from ECU and can range from -60 to +120 mA, depending upon engine operating conditions.