If it happens to u. You can take the broke line off, cut it in half, have it welded shut, put it back on. and go to where u can buy a new line. you might could bend it in half and hose clamp it folded to get you off the side of the road.

# 4 injector tube
 

I just replaced one today , the dealer has a new upgraded clamp with rubber piece instead of the blue clamp . Stopped the tapping noise and won't bust .

Scheid will bend one to order much cheaper than the dealer. Cummins is also much cheaper.

Sent from my DROID RAZR using Tapatalk 2

Had the same problem but it cost me an overnight stay and thanks to Northeast Diesel in Conn. I was on the road next day. home was Maine some 5 hrs away. Big disapointment
Cost me big time. I check them all the time now. Took the broken line to a welder and had him weld the flare nut opening closed so if it happens again i can screw it on the rail and run on 5 cylinders for a while till i get help.

Recent adventure I had with mine.

http://s209.photobucket.com/albums/bb292/CTB06/?action=view&current=20130222_1321201_zpsce2a69a9.mp4

This is the 3rd time mine has broke the #4 line.

I had #4 line break/cracked at fitting going into injector tube. stopped didn't shutoff and opened the hood fuel was shooting over the fender drove it to work 43.00 @ cummins. Replaced it in the parking lot @ work the cummins line had the clamp on it
:tu:

My #4 line clamp has come loose twice. First time I just tightened the clamp. That lasted a little more than a year. The second time it came loose, I pulled the clamp apart and got a piece of 1/4 inch nylon hose (some of what I had left over from my water/meth injection kit), split it down the middle, slid it onto the injector line where the clamp holds it. I then put the clamp back together, used red loctite and tightened. Its been holding for over 3 years now with not a single problem. Dodged a bullet twice. I check it now and then to make sure its still tight. Worked for me! :yeah:
Its probably a good idea to do even if its never loosened up on you and caused a line failure. Catch it early.

I had the #4 hose fail on my truck also; I was told that I was lucky because that is one of the cheaper lines to replace, $60 later I didn't feel very lucky.

With the high demand for that fail-prone line, Im surprised its not alot more expensive.