I used to like to run mechanical pumps when they fit the application.
However, today's fuels seem to get into vapor lock type situations easier than in the past.

I'm not a chemist, but (I did stay at a holiday inn express last night) I thought I read that there used to be additives blended into the gas to help prevent the onset of vapor lock by raising the boiling point when under vacuum.
Basically, all newer vehicles have the fuel pump in the tank, so the entire system is constantly under pressure, so the additives used to help with the vapor lock are no longer needed, or used.

Over the last couple of years I've had several customers contact me about vapor lock issues with cars still running mechanical pumps.
Never a call like that from anyone running a properly thought out electric pump/system.

There are so many options for electric pumps now, you should always be able to find something that's a good fit for the application.