Vapor Lock Opinions

Thanks guys! I had always thought the plywood was a better thermal barrier but according to this site ( http://www.engineeringtoolbox.com/thermal-conductivity-d_429.html ) I found they are essentially the same. Have also found some very intriguing alleged fixes elsewhere such as:

A metal hanger in the fuel line between the filter and the carb. Based on the premise that a vapor cannot form against an object. Even if true it won't help if my problem is in the bowls.

A clothespin on the fuel line. This allegedly acts as a heat sink.

Ultimately, I will probably go with a phenolic spacer, an inline electric pump and a return line but I thought these were interesting enough to share.