What size fuel line?

I’m asking for my son.
He has a 115 Yamaha 4 stroke and has to replace the fuel line going to the motor from the water separator. He tells me it’s a 1/4 inch and I’m saying it must be 5/6. Or 3/8. I said a 1/4 inch it to small the barb on the engine side it plastic so it has to be the right size. Does anyone know the size? It’s a 2003. 4 stroke Yamaha out. board. Thanks for any reply’s
 
I went through this recently. Our 1980 V-20 had 3/8 hose.

And a super tiny valve at the fuel tank. Size of the opening was about 0.20 inches. Not even 1/4.

I don’t know if this was original or an after market add on.
 
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