Discussion Forum - Northstar Chevelle Club

On my 72' for the last few years I have been running a non-EEC tank from a 70'.  I recently swapped to the 72' tank with EEC.

As I understand it, the three lines from the gas tank (sides and middle) run into a metal thing for a lack of a better term (canister?) behind the rear seat.  From there I understand one line runs from the canister deal up to the engine.

If you look at this post you can see the three lines:

http://northstarchevelles.activeboard.com/t48321790/1972-chevelle-fuel-tank-straps-sending-unit-and-cap-75/

I don't want to run a line up to the front (sorry emissions fanatics). 

Can I simply block 2/3 lines from the tank and vent a third?

Do I even have to vent one of the lines?

Or do I have to go to that canister deal behind the rear seat and vent from there (out the 4th port that would normally go to the engine)?

Thanks