Could it be a overheating coil..?

Very similar issue here. New fuel pump didn't cure it. I can leave the fuel door open and see no change. The air in my see-thru fuel filter is making me crazy.

Yep I hear ya.
my see-thru fuel filter show air when warm as well. Apparently it is normal though and most people just say to switch over to a non-clear filter so you can't see the air LOL.