I used translucent yellow Tygon line (sleeved with regular fuel line as suggested by Robyn) on the turbo side of my rebuild. Only have 1000 miles on them, and this summer should test them. The nipples on the #4 injector would not line up horizontally and trial fitting the heat shield showed that the shield would be in direct contact with the lines.
To get the nipples to line up, I swapped the injectors around until I found one that would seat with the nipples horizontal. It was a PITA and I should have done that when the engine was out of the truck. Also used plastic tie straps to pull the lines a little farther from the heat shield. And a piece of Tygon on the fuel return line coming out of the IP. You can see air bubbles going through it if you have a leak in the system.
Black 95 6.5TD, 929 block, 173k miles, 65k on IP, 48k miles on self-rebuilt engine done in '09, 6 L&S Full-torque inserts in outer main crank holes, Clearwater heads, Fluidamper, rebuilt NV4500, 3" downpipe, 4" exhaust, no cat, dual T-stats, 9 blade fan, spin-on 180 degree clutch, Heath hi-flow water pump and turbomaster, PMD relocated, OPS relay mod, Heath PROM upgrade, and Kennedy headlight harness upgrade soon. Now use semi-syn Lucas 2-cycle oil every fill-up which greatly reduces the frequency of DTC 35-36 codes the PCM/ECM throws.