Zaphod 350z

I think I found the fuel line on the passengers side feeding what looks like an FPR. At the bottom of it are brass fittings feeding the driver's side fuel rail and there is what looks like a fuel return but it has an evap valve on the top. I traced that line and it goes to the back of the car. I'm a little confused by that. I'm getting the service manual soon but I wondered if anyone knew anything about this.

thanks.