Took our 2009 Z4 in for the in tank fuel pump noise, and the dealer replaced it under warranty. They told me that there was a bulletin that provided they should replace the fuel pump if the customer complains of noise. I was very happy to hear that BMW had taken this position. I was surprised to learn that there is a large access port in the tank that unscrews and allows access to the in tank pump and fuel filter (also in the tank under the fuel pump).
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