I had a crank no start on my 2006 F-350 6.0 after the truck was at operating temp. I just finished installing the STC fitting upgrade and the fuel pressure regulator upgrade. The truck fired right up and ran great with a small whistle but when it hit operating temp, it still has a crank no start until it cools down. Help!!!!!!

Update;
Went out this morning and the truck fired right up and ran smooth.