Jethrow,
As others have noted you can go either way.
I am running -8 braided lines from a Commodore tank with Walbro fuel pump. Billet fuel rails from ASE.
FUEL SYSTEMS - FUEL RAILS LS1 LS2 LS3 L76 L98 - ASETurbo
My return goes via an Aeromotive regulator and then back to the tank.
Hope this helps,
Ben