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:
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I ripped out the Legacy hard lines and laid them down alongside the MG to check for length and shape.
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My car already had the positive battery cable running inside the cockpit along the tunnel:
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So I just added some more…
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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.