"""""""""The rest of the high pressuer fuel lines serving the injectors
usually don't have to be replaced .""""""""""""""

What??????????????????????

Please, is it my poor English or you are suggesting to NOT replace the hoses
on the engine going to the injectors?????????

http://www.benplace.com/odd/rust2.jpg
(do you see a nice cracked hose)

What about here:
http://www.benplace.com/fi_hoses/100_0011.jpg

Ben