Grrrr....Woo-Woo Noise From Fuel Filler Door is Back.

[paulofto]

This may not solve what is causing it but a piece of duct tape over the hole on the hinge side below the filler door with a small hole poked in the tape gets rid of the noise. I think the system is working fine but the opening is designed wrong and allows a strange harmonic to develop. The reduced opening seems to cure the noise if not what is causing it.

[Need_for_speed]

Thanks Paul, but I'm reluctant to do that as the car was completely quiet, no blowing bottle noise up until a couple of months ago. So I'm inclined to believe that there's a component failure somewhere. Replacing the Regeneration Valve made a big difference, but there's still something wrong somewhere in the system.

I really don't want to continue to blindly pour money into parts to try and find the solution. I've already spent close to $500 on parts to try and solve this issue. The EVAP system is extremely complex with half a dozen valves, tubes, etc. I have to think there's a better way to troubleshoot than to just replace components one by one.