X5 Bio Diesel Fuel Injection System Fault, Please Help?

[SeanBage]

Hi

I have a BMW X5 e53 3.0D on from the year 2003.

I have just encountered a problem today. I will tell what has happened, and hopefully someone can HELP?

I used biodiesel for the first time yesterday by a mix of about 50/50 regular diesel to bio diesel, (I know I probably should have used more diesel now). A day later the car went into limp mode on a bank and slowly got to the top, the problem then went and the car drove as normal.

A day later than that I drove the car for about 10 miles and on the same bank (coincidence?) the car went back into limp mode and eventually lost all power and came to a stop, with a note on the onboard computer saying 'fuel inject problem'.

The car now starts sometimes or doesn't even start. I have used some diesel injector cleaner (Redex) to no success.

I am waiting for a new fuel filter to arrive which will be changed.

Has anyone ever had the same problem?
Does anyone know a possible fix for this?

I greatly appreciate all help from everyone, big or small so thanks in advance.

Sean

[Kjetil Somme]

Check the inline-pump that is located under the car. These tend to malfunction, but the engine will still run if the tank is not near empty. With the additional thickness of biodiesel, the fuelsystem needs the extra effort provided by the inline-pump to provide enough fuel at the correct pressure to the high-pressure pump.

You can try a metal rod against the side of the inline-pump and your forehead to listen if the pump is working or not. It should start to build up pressure for a couple of seconds when the key is turned to II. Have a friend turning the key without starting the engine.