Have read that a lot of people keep a spare #4 injector line in their truck just in case. Not a bad plan to carry a spare one, but unless you have ever actually changed one you might want to rethink your ability to change one out quickly while broken down in the middle of the road. Changing one out is fairly simple in your shop with proper tools (think 3/4" tubing wrench, 10 mm socket with extension at a minimum) you likely have in your shop. Also even in best of conditions it is likely to take close to half an hour because of the limited access and all the stuff in your way. What I bought to keep in my truck is this:
http://www.genosgarage.com/product/lt-testca/toolsIf I lose an injector tube in the future I just need to simply unhook the common rail end of the leaking tube and pull it out of the way enough to install the cap and be on my way. Even with just a cheap 3/4" wrench or even an adjustable wrench a person should be able to have the engine back running in approximately 5 minutes. All of the common rail fittings (even the most hard to get to #6) are much more accessible than the much harder to get to injector fittings, let alone trying to deal with getting the tube clamp removed. (when I changed out my tube, the clamp mounting bolt was very tight and I needed a 6 point 10 mm socket and a fairly long breaker bar to get it loose without rounding off the head of the bolt) Also, this way if any one of the 6 tubes fail, I have the necessary part to get the engine running again and am able to drive it out of the middle of the road and home or where ever necessary. Just my opinion after dealing with the issue on the road and changing out a tube at home. You need to do what works best for you.
