Join Date: Aug 2018
Location: Lowell area, MA
Mentioned: 3 Post(s)
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I haven't had machinery with a metal tank, mine are all plastic. But I've heard people suggest leaving metal tanks full to try and reduce condensation & rusting in the tank.
The closest thing I have to your setup is my lawn tractor, which is under a tarp, outside. Plastic tank, though. I keep stabilizer in my gas year-round (even when I fill the can in the middle of the season), I consider it cheap insurance. I'd add an appropriate amount to what's already in the tank (or treat the new gas, then add that, and run the engine long enough to draw the stabilized gas into the carb).
Running the engine is good, but just doing that won't really keep the gas fresh. I'd add stabilizer to your gas, whatever you decide to do. It's a good way to help reduce the risk of problems.
One option (if you have a petrol-powered car) is to siphon the fuel out of the generator's tank, and put it into the car, every few months. That's one way to change out the supply. Or just keep a small amount in the tank, and the rest (stabilized) in a gas can. That way it's easy to just add what you need, or dump that into the car every few months, to put fresh gas in the tank.
Running it periodically will help you keep an eye on the engine's condition, and avoid suddenly discovering there's a problem when you actually need it. When you run it, I'd add a decent load, like maybe the 2000W kettle or something, to let the engine actually work. Then disconnect the load, close the fuel shutoff, and let the engine run until it dies.