ORIGINAL: Ed
With a -T-, you are introducing 3 more potential air leak points, rather then a straight line to the Carb. Think about it.
Actually (for those that believe that), it's 4 points; 3 at the 'T', plus 1 for the plug.
Another point is that some people use a filtered clunk. If you use a -T- with a filtered clunk, then you are putting unfiltered gas directly into the Carb line. To filter properly using a filtered clunk, you must use a 3 line system.
ed
Actually, you can do that at your gas jug itself and be just as good as a 3 line but use a 2 line w/'T'.
Put a good quality ceramic clunk in your
gas jug and the
gas tank, and the 2 line can't get unfiltered gas.
The ceramic clunk/filter I prefer is a
Poulan 530095646.