Just as the 99 E300 fuel lines need for replacement, I'm getting the indicators of diesel fuel leaking under the hood in the CDI's engine compartment.

Longer cranking time to fire, & diesel fuel leaking on the floor of garage, accompanying the wet diesel fuel smell after any shutdown, necessitates delving into it now.

This is my first time doing the CDI's lines. Is there a tutorial / special tools on this procedure that one of you guys in the know can alert me to? Or, is it a straight forward, easy R & R?
Probable replacement parts/lines needed?

I haven't started the project yet, so I haven't located the leak(s) as of yet.

Any helpful advise appreciated!