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"Blowing Bottle" Noise From Fuel Filler Area

  • 2000
  • Boxster
Mileage: 
69 000
Fuel System
Portsmouth, 
Rhode Island

Thanks in advance for your help! My vehicle is a 2000 Boxster 2.7L.

My issue began with the infamous noise from the fuel filler area that sounds like someone blowing over the top of a beer bottle. The noise was fairly continuous at slight acceleration around 2500 rpm and would stop with throttle change. After much research here and elsewhere, I elected to change the two purge valves in the front passenger fender area (P/N 996-605-213-01 and 996-605-201-01) along with the fuel filler cap. This did not resolve the issue.

After more research, I elected to replace the Regeneration valve under the engine intake on the driver's side (996-110-129-06). At first, this seemed to totally resolve the issue. But now, after a long drive, I noticed the same noise coming from the fuel filler area, only its characteristics have changed. Now, the noise is extremely intermittent, lasts for only a few seconds, and occurs independent of throttle position or RPM. Changing throttle neither makes it appear or stop. No CEL, no codes.

I have yet to replace the valve on the fuel fill tube (996 201 143 01), but I have no issues filling the car with fuel. I also understand that there is another purge valve on the carbon canister as well as a number of other components in this system that can fail. Unfortunately, without a CEL and associated code, I'm left to blindly replace parts hoping I fix the issue. As I've already spent a little over $500 on parts, I'm reluctant to move forward without a better idea of what might be causing the issue. Any assistance in troubleshooting, or any suggestions as to which part might be the culprit would be very helpful. Thanks again!

Kevin

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