Wix 33737 filter/regulator question

I'm using the Wix 33737 filter/regulator with an Airtex E2000 external fuel pump. I need to know which port on the filter is the fuel input and which port is the fuel return. Depends on where you look what answer you get. LOL I cant find specs from Wix. I currently have it with the 5/16 center port as input and 3/8 offset port as the return. I think this is wrong. The last picture is one I found somewhere online. Help!!