Fuel line indentification

[Hrphilipson]

Ok so i know i can supply power to intank fuel pump and find out, but hoping to not make a mess.
I have an 86 ranger originally 2.9 FI. Im doing a 302 carb swap and running lines to the new regulator (eliminating high pressure pump of course). The 2 lines going to the surge/filter canister, one is a 5/16" quick connect (top line), the other is a 3/8" quick connect (bottom line). Which one is supply and which is return? Again id rather not make a mess powering the pump to find out.

Thanks

 

[RonD]

The larger connector is always the "OUT to engine"
Smaller is the Return line

Fuel lines themselves should be 5/16" for both

 

[Hrphilipson]

I figured, but both lines are 5/16". Only the connector is 3/8"