Howdy yall!
Ever since I've gotten my 08 mustang it's had a tuff time starting up on the first try.. When I first got it, it had a code for the fuel pressure regulator reading to high so I went in and bought me a new one off ebay and the code hasn't come back since (one problem solved). After that fix I still have the tough start on the first go.. then thought the fuel filter was clogged so once again went at it and replaced it.. (no difference). Starting to believe it's just the sending...

New fuel pump?