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I would go to another dealer. I had the whining noise and I first tried to run the car with a full tank and did not let it get below 1/2 to no avail. I brought the car in and they replaced the lpfp right away. I asked the SA if he used diagnostics or just listened to it to make the determination to replace it and he said that they simply listened to it. That was about two months ago and I have not had a problem with it since. It is as quiet as it was when I first took delivery.
From reading the posts here, I think I may have brought the problem on by allowing the tank to get down to 1/4 full a few times. Since I had the lpfp replaced, I will not let it get below 1/2. I would fight them on this. It is not normal or enjoyable to drive the car with that much noise.
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E89 - 2010 Z4 35i (Orion Silver, Ivory White extended, anthracite trim)
E85 - 2006 Z4 3.0i (Monaco Blue, beige leather, Dark Poplar wood trim)
E85 - 2003 Z4 2.5 (Sterling Gray, black leather, Sycamore wood trim)
E36 - 1998 Z3 2.8 (Red, black leather, wood trim)
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