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.
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