Leaking Injectors DD15

I have a couple of injectors that seem to be leaking just a bit.......no performance issues, but you can tell that they're leaking. My question is, how hard is it to change the 'O' rings and is there some kind of torque setting on these? It looks fairly simple, but before I start tearing stuff apart, I'd like to know if I have the skill set to pull this off.

Thanks in advance

 

actually, I meant to say the fuel lines going into the engine.....my bad

 

no, at the top where the fuel lines go in.......look, I'm not a mechanic, so some of my descriptions are kinda vague, but where the fuel lines go into the motor on the top. A couple of them look like they're leaking a bit. I was wondering how hard it would be to change out the 'O' rings or whatever it is that keeps them from leaking.

 

uh, ok. I appreciate the advice. Sounds like something my tool box won't support. Thank you very much for the advice.

 

nothing yet. They're really not leaking that bad.