[NewArt]

If anyone is interested, I am documenting my "difficult to impossible" refuelling problem over here:

Changed gas tank bleeder valve, now it won't fill! - 986 Series (Boxster, Boxster S) - RennTech.org Forums

Here's the first post. Feel free to chime in. I need all the help I can get!
And yes, I have used the search tool.

In the "If it ain't broke" category.
Symptoms:
Hard start when warm, after sitting for 15 minutes or so; intermittent Coke bottle sound (low whistle) at low speed. No problems fuelling car.

Attempted solution:
Changed bleeder valve, also known as fuel tank ventilation valve 99620114301. This valve is not electric but mechanical. The gas cap, when closed tightly, pushes a little piston which opens the valve to recirculate the vapours.

Result:
Can't put gas in the car! Takes about a litre then spits it back out at me!

Okay, so I have obviously up royally here. So I tried putting back the old part. Nope. Poked my finger in the filler flap: No click (should there be one?). Checked the E6 fuse. Seems okay. Could it be another valve/switch or what? And what have I done to cause this, aside from fixing something that wasn't broke?

2001 Boxster S tip