I'll tell ya if there was someone out there who was really good at doing brake lines and had the tools to make 5/16 & 3/8 push connect fittings on the lines you could probably make some coin creating solid fuel lines for the Duramax colorados and canyons. Its so dumb that gm decided to do a soft/hard line mix the soft line just adds a point of failure, and there is no flex in the motor mounts at least not enough to require the mixed lines up front. I'm changing to -6 AN nylon braided hose only because thats the only option aside from the stock lines which I also ordered yesterday as a spare. At least with the all soft line I can re route it were it won't rub or get stuff caught in between things. The stock line sits directly on around 4 hoses and at least 2 hard metal parts hence its probably a good idea for others to check theirs and zip tie some rubber or something in between the contact points.
Also you won't even realize this has happened on the return line unless you are stopping frequently and smell diesel or someone yells at you, the truck didn't run any different and no codes are thrown . I smelled the fuel but I dismissed it thinking I spilled some 2stroke gas in the bed then I got home and the whole underneath and driver side was wet covered in fuel, I turned my key to acc and could see diesel just pouring out of my skid plate.
For anyone looking for the parts to do this the summit racing part#s are.
ICB-AB809-02B. female 3/8 push connect to -6 an male
Rus-640940. Male 3/8 push connect to -6an male
Dwk-6-02-0864-3. -6 an nylon braided hose
Sum-220690b. -6an hose end to -6an female thread
These will work to replace any section of used line on these trucks
