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I have the same sound. Its the Fuel pump (eom) (archive)

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Posted by ChrisK on October 01, 1998 at 13:44:52:

In Reply to: Strange Noise, Any info? posted by STeve on October 01, 1998 at 11:40:53:

: Bought a 98 Z3 2.8 about four weeks ago. Immediately we
: noticed a strange noise when sitting in the car at idle.
: Sounded like a "white noise" kind of static. Yesterday the
: dealer had it all day. When I picked it up, they said they
: also heard the noise but couldn't find the cause. Said they
: "called" BMW and were told this is a normal noise caused by
: the fuel return valve. According to the dealer, BMW said
: this is a normal noise which is noticable on some cars but
: not all vehicles. Also said there is no fix for it. This
: sounds kind of fishy to me. Has anyone else ever heard of
: this? Thanks (PS the noise is so annoying you have to turn
: the radio volume up or hum very loud to not notice it.)

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