I agree Nel: I was thinking the exact same thing, so I topped off this evening and parked nose down. Will inspect fuel lines, etc. before starting tomorrow morning. Hopefully something will show. I have a fear however, that a leaky O ring may allow air to leak into a line but may be a good enough seal to keep fuel from leaking out. The lines are original, and 187K, but seals were just replaced 5K ago.

I believe Hunter mentioned in some thread that there could be micro crazing/cracks in the lines letting air in but still intact enough to keep fuel in.

I've got a good light and inspection mirror for a thorough check in the morning.