You don't need to replace the fuel lines, just tighten all the clamps you can get to.
I bumped my thread "got some new stuff for engine R&R" to the first page yeaterday. I think there is a picture in there of the bottom of the intake and the clamps.
Just tighten them.
I just lifted the intake to replace the o-rings. But did tighten them all when I had it off for the short block.
215,000miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
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