For a 13b NA,

What size fuel lines are commonly used for forward of the fuel pumps?
And prior to the fuel pumps?

Also prior to firewall forward,  is there anyone who is successfully
using Nylo-seal or similar nylon 11 or 12 tubing as fuel lines?  I ask
this as my kit came with big fat rubber fuel lines, however with having
to route 4 fuel lines into each wing their size(1/2" OD) presents some
challenges.

Thanx...
-Scott