perhaps maybe there is something funny happening with the fuel pump but only at startup? The only way I can see that happening, is if there is something wrong in the ECU or something ya know? But seeing as the swap is over a year old, and nothing has been changed in that area since, and it has run fine until now....it's just a bit odd.
I had a full tank when it happened the last time. I'll keep my eye on it, see what I can figure out.
- Nathan