I did not replace my in-tunnel line but when I installed the Subaru engine I ran new fuel injection hard lines front to back—fuel and return. Since I was not taking the body off the pan I ran the lines through the interior of the car low on the passenger side of the tunnel.
Shocking? Well, actually, that is how Subaru did it:
I ripped out the Legacy hard lines and laid them down alongside the MG to check for length and shape.
My car already had the positive battery cable running inside the cockpit along the tunnel:
So I just added some more…
With the carpet on installed you’d never know they’re there. I repurposed the original fuel line as a vent and put the Suby’s original charcoal filter and catch valve on it.