You can fill the carb. float bowl without turning the engine over. Some engines are notorious for boiling the gas out of the carb. after the engine is shut down. If your have worked on the fuel system you can pre-charge it with an electric pump. Also if you are having fuel problems you can pull the hose from the carb. and run the pump to see if you have any issues. Not all engines have a port available for a pulse pump.
I fill the bowl by disconnecting the fuel line form the pressure side of the pump putting a small funnel in the line and pouring in gas. Never had an engine boil the gas out of the carburetor, Sounds like a very unsafe condition, explosive fumes. Never run into the port problem on a tractor that had a fuel pump as original equipment. With a good battery turning the engine over isn't difficult. Thanks for the insight. I still like the pulse pump if I have a choice Don