I am building a 650HP 500efi. I was told to run 1/2 inch fuel line. Braided hose is sold in AN8 7/16 or AN10 9/16. Which one should I run??? Jeff Wurl

-8 is considered 1/2" and -10 is 5/8". -8 should be more than enough.

i run 10 from tank to fuel filter,then8 to the fuelpump,then 6 to each carb,540 blower motor.for n/a motor,no need for 10 from tank,8 will do just fine.