Crimping or blocking the injector line is OUT, Trying to 'bung' it up with some 'goop'is not going to last, at all and a replacement line of just copper tubing is not strong enough...BUT having said that a 20mm section of fairly tight fitting copper tubing OVER the break and silver soldered will last the life of the vehicle! (just be sure the silver solder doesnt get inside the original line) If you "Flare" both ends of the short section slightly, you can run a bead of silver solder round each flare. Unfortunately you need a bit of original pipe showing out of the original fastening flare nut.

