Fuel line replacement

I'm in the process of cleaning up the motor on my ski and want to replace all the fuel and cooling lines. I noticed there is a larger line that goes into a Y fitting then splittibg into two smaller lines which go to the carbs. Most of the cooling lines look to be old and chafed pretty bad. There is also a primer installed with smaller lines. Can anyone help me out with correct line diameters for this setup? I will also be replacing the fuel filters, any recommendations besides stock?

Cooling?
Fuel- large and small?
Primer?

Just want to make sure I have the best setup that won't starve or flood the carbs.

It's a 96 by the way.

Thanks!
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