Well, it turned out my fuel line wasn't copper. From looking at it with not enough light, and it apparantly having overspray from a couple paint jobs over the past 23 years, it looked like it was dull copper.

I took it off, and found it was steel

So, I put it back on, and added some cool tube around it near the tranny cooler.

I have put on an electric pump. I'll see how it goes now with the vapor lock.