This thread is in regards to the low pressure fuel pump that is in your gas tank. I have a 2010 that was built in October and I had a faulty low pressure fuel pump that I recently had replaced. I don't know if this issue has been resolved in the 2011's, though I hardly think so as the 2011's were in production only months after the 2010's. I haven't heard of a 2011 with this problem yet. I noticed the humming after seven months of ownership.
The 30i's do not have a high pressure fuel pump.
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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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