Whistling Noise from Fuel Fill Area -- Fixed!

[Need_for_speed]

Vehicle: 2000 base 2.7L

Issue: classic "blowing over a bottle noise" from fuel filler area. No CELs/codes. No issues filling with fuel. No issues starting after fueling. Noise would appear under light engine load. No noise during idle or hard acceleration. Noise was very irritating to passenger seat safety device, which in turn, irritated driver.

Resolution: replaced p/n 996 110 129 06 "Fuel Vapor Regeneration Valve" which is located under the intake manifold, driver's side. It took me around an hour to complete the job (for a skilled DIY or pro technician, about 20 minutes).

It's probably just me, but it seems to me that the engine idles a bit smoother, especially under load, and has just a bit more zip under acceleration. Additionally, the passenger seat safety device is much quieter, at least until around 4000 rpm...