Pumping old gas from my boat

When is the last time the engine was started? If recently did the engine run ok? I would certainly think of ways to use the gas by running the engine... unless this is a super expensive high performance engine
The engine was run last year several times on muffs and additional stabilizer was added last fall (I think).

The engine always runs fine. It's fuel injected.
 
I dont think 1 year old gas that was treated is going to give you problems-most of us here are way too paranoid about breakdowns.
Maybe I was not clear. While the engine ran fine last year on several test runs no gas was added. The gas is more like 3 maybe 4 years old. Re-stabilized each fall.
 
I had 30 gallons of bad gas last season and it was stabilized 89 octane E10 that was only about 8 months old, so I did not suspect the gas at first. What helped me figure it out was running the boat on an outboard tank with fresh E0 fuel. All season it would not plane, would stall at idle, etc. Went through ignition and carb, same result. Ran perfect when I hooked up the outboard tank. I still thought no it can't be the gas, so inspected the fuel tank pick up tube and anti siphon valve and they were FINE. So it was the **** gas!
Since my recycling place will only take 5 gallons a week, I paid a guy who works with local marinas to pump it out. 15 min and done. Money well spent. 1st pick is removing old pick up tube and anti siphon valve, second pic is test them to see if there were any vacuum leaks (already tested anti siphon to make sure it opened).
Lesson learned: assume nothing, leave no stone unturned, and use a process of elimination.
Anti siphon valve and pick up tube.webp
Fuel pick up tube and antisiphon valve test for vacuum leaks.webp
 
I’d just siphon it out personally. If the boat is out of the water on stands or a trailer you can get the containers well below the boats tanks. Your going to remove the gas exponentially faster if you put a 1 inch hose or larger in the filler neck and siphon vs using a pump to suck it through a tiny (probably 3/8 in) gas line.

When I worked at a boatyard we built a hell of a transfer pump out of a fairly large old bronze jabsco raw water pump (probably off a 16v92 or something) and an AC induction motor. That thing moved probably 40-80 gallons a minute depending upon what size hose you could fit in the tank. Pumped it into those 275 gallon cubes that the fiberglass resin comes in. Used to have to pump hundreds and sometimes thousands of gallons of gas and diesel out of boat that were getting scrapped or had been sitting for years and even decades in our yard unused and then suddenly the owner decided to put it in the water again. That pump they built out of old junk parts they had laying around worked better then any off the shelf commercial transfer pump I’ve used.
 
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