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3/8" ID hose will fit both the PCV valve & the intake attachment pipe... But as Spike mentioned, you can't use fuel line because it will collapse from the high vacuum when it gets hot & soft.
I found a link to a place that sells 3/8" PCV hose (designed for PCV) but I personally have never tried it. Its pretty cheap. Might be worth buying a few feet and checking it out ... And letting us know if it's a good replacement.
PCV Rubber Hose