Vapor lock- additive?
I have beeb using Driven's Carb Defender to deal with other ethanol issues for many years. (Summit, Jegs, Amazon) Solved the carb corrosion issues. Ethanol attracts and bonds to water in the air and in your fuel. My understanding is that the ethanol actually evaporates less readily than the modern gas. In the fuel bowl the gas goes away leaving the water laden ethanol behind, hence the carb corrosion issue especially on cars not driven all the time. I put in a small vane type fuel pump in line back toward the tank. Before starting I run the fuel pump far the count of 20. This fills the fuel bowl in the carb and the car starts much more easily. That's all I use the electric fuel pump for. The mechanical pump pulls gas through the vane style pump without any problem.