Don't contaminate the new injectors in your 2004.5-2005 GM 6.6L Duramax LLY by reusing your old lines, replace them with the Bostech DEC010831 Injector Line Set. This new injector line set provides you with an OE quality fit and finish.
Wish I could leave a good review but I just can't. I bought a NEW set of Bostech( Part# DEC010831) injector fuel lines on 1/1/2021 and when I received them on I notice they had brown varnish and corrosion inside the lines. I had just installed $2600 worth of injectors in my Duramax and couldn't risk contaminating my new injectors so I called XDP about the issue. They were very nice about it and sent me another NEW set of lines out via ground delivery which is VERY slow. Just got the set today(1/20/2021), opened the box and was dismayed to find these NEW fuel lines also had brown varnish and corrosion inside the lines. Not sure what XDP calls new BUT my definition of new is bright and shiny inside and out! My truck is down and did not want to wait another 7 days for ANOTHER set of NEW lines to get to me. I got my WD40, Dawn dishwashing detergent and a straw cleaning brush, spent an hour or so cleaning these NEW $300 fuel lines. Not sure what kind of quality control they have but they need to step it up!