[T-Bone Texan]

That was fascinating information. Thank you.

All this technology is slightly before my time, and it is very interesting.

I am learning about this archaic concept called “vapor lock” right now. I don’t think vapor lock is even possible in a modern car.

Thoughts?

[freedomlover]

Vapor lock can happen in practically any system which transfers liquid fuel, if the fuel gets hot enough (at a low enough pressure) to vaporize. The typical problem is that the gas pump won’t work as it can’t pump vapor.

Vapor lock is less likely in a fuel injected system due to the positive pressures which tend to be the lines, reducing the chance of vaporization (even if hot the pressure keeps it from going to vapor).

But it can happen. When it does it can really tough to diagnose. Takes a lot of time waiting for the engine to cool.

[A Navy Vet]

"That was fascinating information. Thank you. All this technology is slightly before my time, and it is very interesting. I am learning about this archaic concept called “vapor lock” right now. I don’t think vapor lock is even possible in a modern car. Thoughts?

No "vapor lock" is not prevalent in modern car motors because of the advanced fuel systems. Back when, if the fuel line got over-heated (fuel line against manifold, etc) it would turn the fuel into a gas, which would cause a gap from the fuel line to the carburetor and deprive the carb of fuel and stall the motor. That's why I have clips on my fuel lines in my 58 Chevy to keep them from touching my intake manifold.