Edited: 12/31/2007 5:46:27 AM by toreadorxlt
if you do away with the charcoal canister, you still need a vent line.
You want your feed at the bottom of the cell, because most external fuel pumps are pushers not pullers. This means that you must have good gravity flow to the pump. (I like less than 3ft away from the cell.
I prefer to return through the top so the fuel cell doesn't create a vacuum inside (ever see a crushed poly cell, its probably from returned fuel at the bottom).
If you need a extra bung on your fuel cell, you can get a bulkhead.
http://www.jegs.com/webapp/wcs/stores/servlet/product_10001_10002_119790_-1