My old 115 used 5/16" fuel lines, but I think you need 3/8" fuel lines on anything bigger than a V-4 to make sure you don't starve it for fuel @ WOT! I'd change all those lines to 3/8", and while you're at it, check all the fittings to make sure holes in them are full size. The shop I used to deal with on my old motor once found a 90 degree fitting coming out of a fuel tank that had undersized holes in it! It was responsible for a blown powerhead!
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