Cover them thoroughly.
Leave them open so gas fumes can vent.
Close every other one for even distribution.
Place an air freshener in them.
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Run it once a month.
Take it out and store it with the batteries.
A generator can sit for months without preparation.
Drain the fuel and let it sit.
Add a fuel stabilizer
Both B and C
They should be left hooked up to a charger.
Remove and store them.
Leave them in place so electronics have a power source.
Throw them away. You’ll just have to replace them anyway.
Terminally ill children
At the beginning of the process
DON’T DRAIN THE HEATER!!
After filling the pipes with antifreeze
A little bit at the beginning, and the rest at the end
Here's an interesting quiz for you.