Iremember using one of these and the smell of the oiled gas and the cold air and snow flying back at ya. Then summer came we would siphon the fuel into the lawn mower and run it dry and then mow the lawn all summer only to siphon the mower back to the blower in the fall.
And now you're in San Diego where you likely don't get too concerned about snow.
I pour stabilized fuel into them and leave the remaining until next season.
After closing the fuel valve, I run them until they quit.
(unless they are very close to empty and then I just run them until dry)