Ok so this is a real common issue and the latest design high pressure fitting is a permanent fix from Ford. This issue of blown apart STC fittings started with the redesign in 2004.25. I really thought all of them were replaced by now with one of the two redesigns Ford came up with, I was wrong! Here we have a 2005 F250 no start due to this fitting coming apart so bad it cracked the rear cover. I know if I owned a 6.0L this would be on the top of my to do list for sure BEFORE it fails so I don't get stranded. What is worse is a cracked rear cover is $400 alone not to mention labor. Call this preventative maintenance and here is how to do it in your driveway!