What exactly is the I/D of our injector return lines?
Dayco is selling a new flouroelastomer with a braided reinforcement that is specifically rated for high pressure injection systems and biodiesel (it even mentions it in the specs). Sounds like good stuff, and is supposedly very well priced.
peace,
sam
P.S. The way you can tell if your lines are recent enough is by watching them to see if they start to weep.