I tried the three line / two clunk method which works with a felt clunk for the feed line. Recently I discovered the QuikFire filter that uses standard automotive paper fuel filters. Since using the QuikFire I have not had any engine trouble or dead sticks. One engine that was giving me trouble started running perfectly once I installed the QuikFire. I prefer the two line method while still having a filter before the carb intake. Below are some of the QuikFire features:
1/4 ounce of fuel at the engine for an easy starting,
Has fitting before filter
Smoothes out irregular fuel surges from.
Eliminates two fuel line connections
http://www.jlproducts.net/ProductQuikFire.html