I have a 2011 BMW 323i (2.5L 6 Cyl.). Where is the Fuel Pump relay located? Is it located in the ECU Box next to the cabin filter, under the hood?

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There are two fuel pumps. There is a low pressure pump that hangs into the fuel tank. It is located under the back seat beneath an access panel. This one is easy to replace. The second is a high pressure pump and has two pressure dampers close to it on the driver's side along the frame. Follow the fuel lines and you should find it . This one can be difficult to change and require replacing the special vibration damper mounting bolts for the fuel pump mounting bracket. Just getting the fuel pump out of the mounting bracket may require cutting off the bolts that hold the mounting bracket around the fuel pump. If you have the right tools or the bolts aren't all rusted you should be able to do it, just be ready to cut/replace the fuel hoses so you can take the whole mounting bracket out which will make it much easier to work with on the bench.

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The link below shows where the fuel pump relay is located.  Please click the link below.

fuel pump relay location

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I just verified. It does NOT have a fuel pump relay. Instead it uses a fuel pump control unit. It is located behind the right rear seat backrest.

I have attached a photo of the location as well as the wiring diagram so you can see for yourself that there is not a relay

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