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      08-06-2013, 08:46 PM   #133
Roadstergal
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I had mine replaced about three years ago and the humming has never returned. I was also advised not to let the gas tank get to empty.
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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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      08-07-2013, 02:04 AM   #134
z4z4z4
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http://www.n54tech.com/forums/showthread.php?t=17458
A couple diy options here developed for n54 hi boost/performance community using e85 . Good read and pics.
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Sold 2011 Z4, kept 2002 M3
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      11-27-2013, 05:13 PM   #135
jhentr
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Bought a used 2011 35i with 24k on it. Just after 3 days, I notice the high pitch noise sitting in the passenger seat right behind my right ear.

Yesterday, just had mines replaced at BMW of Riverside and the noise is non-existant. Hope the high pitch nosiy LPFP issue will be a thing of the past (cross fingers) - otherwise, I'll update this thread.

Didn't matter if the fuel tank was full, med, low, the noise was there from start of the car to the shutdown of the car. Noticeable from driver's seat, but very noticeable sitting in passenger seat. Tried different gas too (Shell, Mobil, 76).

The dealer didn't make any fuss about it changing it. Took them a week to order the part and a 1.5 days to install.

I ran the car empty before dropping it off for them, but the said that wasn't neccessary and if they drained out fuel, they would of re-added it back in. But the SA did say that giving them an empty fuel car makes it a lot easier.

Since the wife drives it, she always pumps once it's 3/4 low so hope that will also help going forward.
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      11-28-2013, 03:43 AM   #136
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Mine was fixed again with a software update. The sound is gone for now, but it makes me wonder what exactly does the update do. Maybe the pump is trying to pump more fuel than is necessary? (And if it isn't obvious already, I have absolutely no idea how fuel pumps work.)
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      05-23-2014, 11:02 PM   #137
RecycledTeen
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2011 35is. Yep....
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