Conversions & Hybrids - Gas tank questions

So today I got my '00 T/A gas tank mounted in my pickup. But I have some questions now.

What's the white barbed connector go to? And then off the purge thingy, there is another "fuel line". Off the pickup I obviously have a feed and return line, but I don't know what this other line goes to.

http://i149.photobucket.com/albums/s79/dba4645/CIMG0049h.jpg

Don't hold me to it but the 3rd connection on the sending unit is a vapor return line.

As far as the white one on the center of the tank i'm sure it has something to do with the vapors also.

I believe you can cap both off and just make sure you run a vented gascap.

I believe Chad is right. Not sure about the white one either, but the other one is vapor return to the TB.

The more I think about it here's what I come up with...

The one on the sending unit is for fuel vapors from the intake manifold,

The one in the middle of the tank is where the tank vapors goto the canister for recovery.