My 2000 Boxster S whistles, I hear it at fuel cap area, sitting still and driving. What could this be?

2000 PORSCHE BOXSTER
98,000 MILES
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RAINBOWRIDER81
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Removed right fender and plastic fender well. I believe it's coming from the evaporative control system. The whistling hose connects to the full cap area ( exterior )?
Sep 27, 2011 at 7:15 PM
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JACOBANDNICKOLAS
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That is a breather for when filling the tank. Check to make sure there are no rust holes in the steel filler tube. Check to make sure the fuel cap is good.
Sep 27, 2011 at 7:22 PM
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RAINBOWRIDER81
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I replaced the fuel cap due to a small crack. It did not stop the whisle. I will check the steel filler tube next. Thank you!
Sep 29, 2011 at 8:54 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Let me know what you find. NOTE: Are you sure it what you hear isn't the fuel pump running?
Sep 30, 2011 at 8:33 AM
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