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I decided to use AN6 fittings for the pressure side of the fuel system (43PSI). What would be better:
Aeroquip S/S Braided Hose AQP https://www.csp-shop.com/en/engine/aero ... 6281a.html or
Aeroquip STARTLITE Hose https://www.csp-shop.com/en/engine/aero ... 5771a.html
I am more inclined to S/S hose, but do not know which is better for pressure and reliability.

Both will handle your pressure needs, the stainless a bit higher, it also tends to be more abrasion resistant. I personally prefer a Teflon lined hose but don't enjoy the cost associated with it. Just be sure to install it right and do a pressure test on the system once assembled to check for leaks, no one likes fuel fires outside the combustion chamber