[Arthur in AK]

Although I've never had a vapor lock problem on my A, I did experience terrible problems with it on my '51 Buick Roadmaster. It has a huge straight 8, and a very poorly designed path for the fuel line which crosses the front of the engine just south of the radiator.
My son and I drove it from Oklahoma to Alaska many summers ago. It was incredibly hot that summer - small wildfires alongside some of the interstates.
We kept getting vapor lock, until an 'crusty old' local mechanic we met along the way told me about the clothespin trick.
Honestly, at first I thought the guy was kidding. Or just plain nuts. But after getting stuck again for hours in the middle of nowhere, I found the closest store I could and bought a bag of wooden clothespins.
They sure looked ridiculous on the fuel line, but by God they worked! Got us all the way home without another vapor lock episode.
It doesn't get that warm up here in Alaska, but I still carry them in the Buick's trunk,along with my tools and parts.