Vapor lock and fuel boiling

[big gear head]

I rebuilt a 350 in a '78 Caprice last winter. Everything is completely stock including the emission system. It vapor locks every time it's driven and after it's been shut off and sits for a little while all of the fuel evaporates out of the carburetor. Fuel has to be poured into the carburetor to get it to start again.

I worked on a '55 T Bird a few weeks ago and it vapor locked while idling in the drive way. I had to pour fuel in the carburetor to get it to start again after it cooled off.

I built a 454 for a '85 C10 a few years ago and it vapor locks when driving. It shut off on me a few times before the owner took it home.

My Camaro would shut off on me every time I drove it. When I found out that it was the alcohol in the fuel that was causing it I started running no alcohol fuel and I have no more problems.

I've seen several other people who have been having the same problems. Maybe it's the fuel around here that is causing it, but it seem like there should be something that can be added to the fuel to raise the boiling point so that it doesn't do this.