bucking bronco

I am installing a 302 out of a ford explorer and I am running the new fuel line to the fuel cell

My question is I got the fitting from summit but I dont know which one is the return and pressure line

one of the hoses that connect to the fuel rail is about a1/2" diameter fitting and the other is about 3/8

unfortunatly when I got the parts I rushed and opened all the packages and did not pay attention to which one is the return and which one was the pressure

the link is the fittingsi am referring to
thanks for any help

http://store.summitracing.com/largei...s-640900_w.jpg