First post!

I needed some advice on a fuel tank system i'm trying to build so I figured this would be the place to ask. I'm running a [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXJDJ6&P=7]Fuji BF-34 gasoline engine[/link] and i'm trying to set up a 100 oz fuel system for it. I've got two 50 oz fuel tanks with clunks/vents installed and i'd like to somehow link them together to feed the engine. My gut instinct was to stack the two fuel tanks, take the fuel line from the upper one and plug it into the external vent of the lower one and connect the lower tank to the engine, but I don't want to risk doing that since the plane is close to impossible to replace and i'm still new to RC planes. I've heard suggestions from some other RC hobbyists to somehow set up a T-fitting between the two tanks so that both tanks are in parallel (simultaneously feeding the engine). Another person who previously owned the plane had some configuration that from what I can tell, somehow linked the two 50 oz tanks together, and connected them to a smaller fuel tank (can't be more than 4 oz by the looks of it) which fed the engine.

Does anyone have insights into the merit of these older designs (or better explanation of how they probably should work)? If someone has an easier idea for how to do this...that'd be even better. Thanks in advance!