What size fuel line?

The other day when I pulled my tank on my 01 wr426f, the fuel line cracked, (due to age) so I went to oreilies and bought some 1/4" fuel line and tried it. It was SUPER tight getting it on and I know that is the smallest I could have possibly fit on my 2 valve nipples. Just wondering if anyone knew what size line these run? It's cheap, but just wondering if I should get 5/16", or go to 3/8"???


5/16" or 8mm.


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