Just found that not only the carb on my snow blower, but the tank itself rusted at the fuel sump and outlet, so running out the carb before shutting down isn't even enough these days with ethanol mixed in the fuel. The tank should be emptied also.
Not so easy with a generator that you just fueled during a power outage which ended shortly after fueling. That can result in a couple gallons of partly used gas to find a use for. Also, it means fueling before starting in an emergency -- not something to look forward to at night with below zero temps, or if there are spills in the process, with the enforced wait after. Steel is no longer a good tank material.
Some small engine tanks are now plastic, and one lawnmower tank I have is die-cast alloy. But the snow-blower was steel, and now ruined after 3 years of light use. Not easy to replace because the tank is built-in as a unit with the carb. And the carb is worked into the plastic dash panel structurally, with a built in primer bulb and choke lever -- it's all one unit. The primer bulb itself is cracked from the ethanol. Consumer engineering is in a sad state.