Left to right, fuel level sending unit, coolant in/out, fuel return, fuel pickup, coolant in/out, and a vent.
Pull the plugs off the two center conections and see which one has a pickup tube that extends to the bottom of the tank. I recieved my tank without a pickup tube (someone screwed up) so make sure you see a tube in one of those two middle ones. The coolant tubes make no differnce which one is in and which one is out...i guess you could have guessed that hu? :lol: