6 oz tank uses the same hardware the bigger tanks use, will pass the felt clunk. Here's a link to the bronze colored pick up. Will likely jog your memory once you've seen it. I think they're just as effective at removing bubbles from the fuel line.
http://www3.towerhobbies.com/cgi-bin...?&I=LXD741&P=7
Ahicks, I've had the sintered bronze clunks corrode to the point they won't pass fuel or air. It's the only type I won't use, YMMV.
I do 3D with 2- and 4-strokes and use a plain clunk and inline filter, never have a problem. It sounds like the OP has a heat issue, or a fuel line that's too stiff.