Stolnik

Hello. I am trying to find the right fuel hose size (diameter).

I have Yamaha 97 760 twin carb. Model WVT760V. PRI. ID GP3. It says wave runner on the hull and also Wave Venture on one of the body parts.

Here is the link to the table showing the fuel system for my model:
yamaha fuel partsmanual fiche wvt760v 1997 wvt760 partslist

I need to know the size of #1 and #7 hose. Also, what is the regular hose size yamaha uses (and my particular jet ski) for fuel. How important the diameter of the hose is? For example, 5/16" hose VS 1/4" hose, does it matter which one I use?

Searched the internet for the whole day with no luck. Please help. Thank you very much for your time!