B & C connected would probably be so that the level is equal in both sections and release air as it's being filled so it doesn't get an air lock.
D would probably be your breather for the filler by the size of it and position.
E is probably the evaporative loss tube which would normally go to a charcoal canister somewhere in the engine bay.
Thats my interpretation of the layout as put an aux tank in mine not so long ago and is pretty much how I set mine up less the fuel return hose and evaporative loss tube.
Sender will possibily be out a little, mine is and no amount of bending the float makes it show the correct level. I just know when it drops to 'E' on the gauge I've about 20L left and better fill up soon.
Also I measured the pickup tube for the pump and measured the tank depth as the new tank was wider but less deep than the standard tank. Then adjusted the length of the tube to be a few mil off the bottom of the tank to be sure I have as much usable fuel as possible.


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