As Mark says, modern diesel injection systems run at life threatening pressures, you can't "crack an injector pipe" anymore, once you have done that it has to be replaced,let alone the danger you are exposing yourself to.

Because modern diesels have the capacity to kill me by dermal injection I am very careful as to what work I will take on with these systems, Keith Geach may be along to comment soon, luckily I have a good diesel specialist close by, I know my limitations, we can't do everything on all cars, those days have passed.