Porsche knows. They've at least updated the parts when the EPA heard there was a fuel leak problem. Their response to the govt is that the leak is internal to the tank, and the bad parts have been removed from stock. The new p/n ends with -02.
Porsche pays nothing for those out of warranty.
Well I found a memo from Porsche to EPA because it is a fuel system problem stating that a bit over 8% of the newer 996TT's had pump failures but no release to atmosphere of fuel. The corrective action is a revised part and old parts pulled from shelf.
Huh. I wonder as this is a report on the "newer" 996TT's. I wonder what the failure rate of the old ones are given the longer exposure to ethynol.
Also, 8% were covered by warranty. I wonder if another 20-30% or more were out-of-pocket? Mine is going on it's second replacement pump on a 20k mile car and I'm a little hot about buying a $500+ pump that's known to be a problem. Hopefully the newest incarnation does the trick. Just wish Porsche would pick up the part, I'll eat the tow.
Here's a link to the memo.