As far as I know, it's a single volume.
Due to this, I have the low pressure feed and return to the top two outlets, the top most being the return to the main tank, and the one below it being the feed. The lowest outlet feeds the fuel filter and the high pressure pump, the next one up is the return from the fuel pressure regulator at the end of the fuel rail.
As you can see, I cut the mounting tabs off the pot and fitted it on the 'cool' side of the engine bay, to avoid running fuel lines near the exhaust manifold.
http://www.greatoldone.co.uk/Gooster...d_Again_2.html