Gas Tank Options

[tubbedII]

I've been reading up on LS swaps and was wondering about the return line options. Rather than buying a new tank, would it be ok to tap into the tank's fill hose for a return line?

I don't have any real plans to do this, just trying to gather some knowledge on the subject.

Also, I can't seem to find the difference between these corvette filter/regulators and the other types. Lots of mentions about them, but nothing explaining the difference. Can someone clue me in?

Thanks!