Quote Originally Posted by asmyser View Post
Well that clears some stuff up. But from my last picture line 3 and 4 both go to the carb....and always have, even before swapping to a new one
Don't know if I can provide you certainty on this... sure one of more experienced hands here will chime in. I have no diagram of Mikuni fuel line locations w/me. If nobody helps, I take a look @ my Chilton's manual when I get home later today.

Here's a good diagram of fuel pump connections (posted by Brad).