Why not just plan a fluid/filter change while you're in there? What is the rationale behind replacing the lines? Are they worn?

Don't pour the ATF in your tank. If you have any metallic pieces or friction disc shards, they'll be consumed by your injection system. Additionally, ATF smells HORRIBLE when burned!

__________________
Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]