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I had my low pressure fuel pump replaced with less than 1400 miles on the car. The humming that I heard never went away. It was constant and the only time that I could not hear it was when I was driving at higher speeds, but if I was stopped at a light or driving on secondary roads, it was always there and it was irking me to no end.
Since I had it replaced, it is perfect. I took TeagueAMX's advice and I never let the tank get less than 1/4, in fact I try to keep it at least half full. I think I may have brought the problem on because I was letting my gas tank go less than 1/4 a few times.
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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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