I am having an issue with a sloshing/gurgling noise coming from the fuel tank when starting-and it is intermittent. I've taken it to the dealer and they couldn't find anything wrong with it-the fuel pressure is okay too. It will do it hot or cold but never after it has been run-it needs to set about 10 minutes or so. Recordings are below (made in the trunk):

Engine hot, key turned to position II then off, then to position II then start
https://dl.dropbox.com/u/28884788/Hot%20start.mp3

Engine cold, key turned to position II then start
https://dl.dropbox.com/u/28884788/Cold%20Start.mp3

To me it sounds like air. I've tried running it without the gas cap with no change in behavior. Fuel accumulator, check valve were replaced in 2002 and the fuel pressure regulator hasn't been replaced but holds vacuum. Car runs great and idles fine otherwise.

Any ideas... ?