Type of fuel, temperature and usage are big variables.
An engine compartment mounted pump sucks the fuel from the back. If the fuel gets hot and boils, pump capacity does not matter. It won't pump anything useful sucking vapor.
Current pump gas is made for EFI systems and boils easily.
A suitable electric pump mounted in the rear where it is cooler often works much better vs engine mounted pump. It gets some pressure in the fuel before it gets into the hot engine compartment. That would be my suggestion.
I agree with this. I know many guys run the mechanical Carter pump but I run the Holley black pump mounted right by my fuel tank. I use a 3/8 stock type sending unit and run 3/8 line. Just the fact to have the fuel coming up to the front under pressure rather then being pulled under vacuum will help fight vapor lock a lot, The one problem I see is fuel boiling in the carb which can happen with either mech or electric pump. I like having my electric pump mounted by the gas tank so my fuel is under some pressure coming forward. But that's just me as many do still like to run the mechanical pump. Good luck with which ever setup you use. Ron
