Fuel Pressure Regulator

Pressure regulator maintains constant fuel pressure to injectors. An electric fuel pump provides fuel to pressure regulator. Pressure regulator is vacuum operated. As the throttle is depressed and manifold vacuum drops, pressure regulator increases fuel pressure to maintain constant flow to fuel injectors.

DME/MOTRONIC ENGINE MANAGEMENT SYSTEM RELAY LOCATIONS

Application

⁽¹⁾ Location

318i, 318iC & 318is

DME Master, Fuel Pump & Oxygen Sensor Heater Relays

⁽²⁾ Behind Cover Along Engine Compartment Firewall

325i, 325iC & 325is

DME Master, Fuel Pump & Oxygen Sensor Heater Relays

On Left Rear Corner Of Engine Compartment, In Fuse/Relay Block

525i, 535i, 735i & 735iL

DME Master, Fuel Pump & Oxygen Sensor Heater Relays

Inside Box On Right Rear Corner Of Engine Compartment, Next To DME Control Unit

⁽¹⁾	See Fig 1 .

⁽²⁾	The first relay (viewed from left to right) is the DME master relay, followed by the fuel pump relay, and then the oxygen sensor heater relay.

Fig 1: Locating DME/Motronic System Relays (except 525i)

Courtesy of BMW OF NORTH AMERICA, INC.