Thinking of draining my fuel tank looking for best method. Boat sat last year, fuel was treated, non ethanol.
Draining a fuel tank
Use a syphin. I'm able to remove about 99% of the fuel in my tank. I do it every fall. Bought a nice ball type syphin on AMAZON. It has a brass end peice that slids past the gas tank valve nicely. It has a long hose with a strong rubber ball. Payed about $20 for it. Simple and easy.
If the fuel was treated I don't believe you will have any issues.
If you're worried about it, I'd use one of those shaker siphons, they work unbelievably well.
If you have a few gallons left, just put in a double dose of Sea Foam, and fill it up with fresh gas.
The above said, I really doubt you'll have any issues. I have a generator at my cabin that gets used sparingly. In order for me to use it two things have to happen. 1) I have to actually be up north 2) We have to lose power.
Long story short, the same gas is in there around 2-years - have not had an issue yet...
As long as you have non-ethanol gas in there I would not even worry about it. The last five years because of back issues I have left my Harley sit with a full tank of gas. I drive it three times a year down to the boat launch and back just to keep the motor fresh from locking up. Never had a problem.
If the gas has Stabil in it then it should be fine to use.
True story, I have a 10hp coleman generator. Filled gas tank and double treated with Stabil then stored in shed. Would start and run it every summer for 10-15 minutes then back in the shed, did this for 9 years. On year 10 it would hardly start and then ran terrible, drained the gas and cleaned the carb refilled with fresh stabilized gas and its good to go again.
I certainly wouldn't run my outboard on gas that old, way too expensive to fix than a cheap generator.