Thursday, 2 June 2016

Where is fuel pump relay located on bmw e34 520i

Where is  fuel pump relay located on bmw e34 520i


It is not in the fusebox. It is in the e-box on the passenger side of the engine compartment.

The Bentley Manual shows the fuel pump relay in the box on the passenger side of the car under the hood. Looking toward the drivers side the pump relay is the second on from the passenger side. It is fuse #23. Looking at the bottom of the relay the pins clock wise from 12 o'clock are 30-87-85-86. The third one from the passenger side is the main relay. It is usually white. "The main relay is energized via the DME engine control module and supplies power to many of the DME components and subsystems, including the fuel pump relay. If this relay is faulty, the engine will not start."
the ecu is also located on this same box?


On the right under a black plastic cover with 4 screws, the blue one in the middle is F/P relay. 

Fuel Pump relay


The main ECU (Engine Control Unit) relay, fuel pump relay and oxygen sensor heater relay are located in the under-hood E-Box.  The E-box is under the large black plastic cover at the passenger side rear of the engine compartment.  The cover is secured by four large Phillips-head screws.  Remove the cover to access the contents of the E-Box.

The E-Box houses the ECU, TCU (Transmission Control Unit), ABS control unit and the three relays noted above.  There are also other components, but these would be the major items.  Also note that the TCU would only be present for automatic transmission applications. Additionally, the 750il will have two ECUs (one for each 6-cylinder bank of the V12 engine).

The three engine management relays (ECU, fuel, O2 heater) are positioned between the ABS control unit and the ECU.  The relays are mounted to a small panel.  Note that the actual relay position, in the panel, can vary.  However, the most common positioning is as follows:

ECU relay – Typically closest to the passenger side. Relay has 5-pins.
Fuel pump relay – Typically the middle relay (of the three).  Relay has 4-pins (you may find a 5-pin installed here.  In this case, the center pin is not actually used and a 4-pin relay will work properly.)
O2 heater relay – Typically closest to the driver side.  Relay has 4-pins (you may find a 5-pin installed here.  In this case, the center pin is not actually used and a 4-pin relay will work properly.)

for fuel pump relay (four pin version):
fuel pump relay
Click below for 5-pin version of fuel pump relay:
fuel pump relay

This will help.Thanks.

1 comment:

  1. By configuring that, you can easily operate this system with touch screen support and there are multiple payment gateways installed in the same system. forecourt fuel pumps management

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