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Old 01-06-2013, 04:52 AM
chansonbleu chansonbleu is offline
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Location: East Bay, CA
 
Join Date: Jan 2013
Posts: 1
Mein Auto: 2001 740i
Hi there,

I had a similar issue with a squealing noise in my 2001 740i. The symptoms that I was seeing were as follows:

- Squealing noise from right rear of the car
- Noise persisted whether the car was moving or stopped
- Noise disappeared almost completely after filling up the gas tank
- Noise reappeared when gas tank got below about 1/2 full

I eventually came across this post on another forum, which references BMW service bulletin B 16 02 98: http://www.bimmerboard.com/forums/posts/110831 Basically, this service bulletin identifies an issue where a fuel tank check valve can create a squealing noise under certain conditions, and identifies a replacement part for the check valve. In my case, I had a local independent replace the check valve and the fuel pump at the same time, and this seems to have corrected the issue. So if you find that the noise is less noticeable with a full tank, you might be seeing the same issue. Best of luck with troubleshooting!

Last edited by chansonbleu; 01-06-2013 at 06:13 AM.
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