I found this site a long time ago, as it was mentioned on another site I go on.
Hmm, I have had this problem with one of my older cars, but I can't get it fixed I'm just thinking it's time is up.
Did you check to see if the pressure regulator is leaking? I would check the fuel pressure regulator. Pull the vacuum line off, and smell for gas there. If you smell some gas, but don't see any leave the line off for about 7-10 minutes, and see if any fuel is present in the vacuum port on the regulator, you might have to use a light to see around in there.
If everything is okay, you could stick a fuel pressure gauge on there. Check fuel pressure after you shut it off, it should hold for a long while.