Hard/Long start issue, supply fuel line corrosion?
So for the last couple of months (I know, I know), I have noticed a fuel leak under the tank. I never crawled under enough to fully identify the source. But it seemed to not leak when the tank wasn't full. I have also experienced an occasional longer crank (less than 2 seconds or so), and I assumed it was related. But it wasn't bad at all, so I put it off for another day...
Fast forward to a few days ago and after the truck sitting for a few days (vacation), I had a very long crank before it fired. But it started, so I just assumed it was because it sat for so long, with the leak...whatever. While driving, my fuel range was low (<70 miles). Well when I got to my destination and shut it off for about 30-45 minutes, it would NOT restart. I didn't have any tools with me to remove the prime screw, but I pressed the prime a few times and tried to fire it. It did fire, but then quit after 10 seconds or so. I also saw the "low fuel" light on. And I was parked an a decline (front pointing down), and thought damn, maybe I am out of fuel??! I ended up having it towed home.
Not sure if any/all of that is relevant, but adding for completeness.
At home I replaced the fuel filter (needed to anyway), added 5 gallons of fuel from a portable tank, primed it. It took a good 6-10 seconds to start, but it did. It ran fine. Now anytime I start it, it takes a good 3 seconds or so of crank, but it does fire and it runs perfectly; no hesitation or surges, no smoke, etc. I had never noticed any issues up until this hard start.
Back to the leak. I finally climbed under and this is what I see. Now everything is dry, because I kept the fuel level low I guess. But this corrosion and likely place of the leak seems to be in the supply line right at the quick connect. Could this be the source of my problems?
I would like to replace this with -8AN fittings; has anyone done this? From what I have researched, this is a 1/2" line. I was thinking I could use a 1/2" compression to -8AN fitting on the steel tube. And use a 1/2" barbed fitting to -8AN on the black braided line (cutting off the quick connect). Seem reasonable?
Any other thoughts would be appreciated!
2004 Silverado 2500HD Crew Cab 6.6l Duramax Diesel LB7 Stock