That is what I am talking about. No need to flip breakers, just turn off A/C, microwave, space heaters, hair dryers, air compressors and such. Anything using 110 volts AC that is a big load. The RPM of the genset will not change much, but it will throttle down. For a visual, pull the air filter off of a portable generator. Run it with a load like a hair dryer and a toaster or coffeemaker. Turn it off with the load there and you will see it spit fuel back out of the carb. Run it unloaded and switch it off. You will hear and see a difference in the throttle, and see much less fuel come out on shutdown.
That is only one possibility for the fuel smell at shutdown, and can be easily checked, just try it and see if the smell goes away.
This is just my experience, yours may vary.
2013 Voltage 3905