Ok, my mechanic said the fuel pump is fine, he said the leak off test showed nothing and the diesel specialist would like to bench test them as he (like most people) jump straight to injectors, I'm not denying that its not them but just feel other stuff should be looked at first.£100 just to bench test injectors.....
What actually is the issue with the injectors, what physically happens to them???
So I'm ok to try a new one. If it works do I need to replace the pipes too???