Old gas in tank - problem?

[GearUp]

Howdy.

I have a 35 gallon plastic tank on my boat with a 1991 Yamaha 115 engine. I have not used the boat for about a year and am wondering if I should somehow empty the fuel tank and fill it with fresh fuel before I head out for some crabbing later this month. The tank is half full of old fuel. I do use Ring Free at the maintenance dose every time I add fuel. Will Ring Free also stabalize the fuel (I don't recall)? Should I change the fuel or should I be fine with the old fuel? If I should change it, what's the best way to empty a built in gas tank?

BTW, I am planning on decarbonizing using Sea Foam as I have heard many good things about it.

Thanks in advance,
Chuck

[Lead Bouncer]

cheaper than carb overhaul. There are fluid pumps to buy. Check with county to find out about gas dumping. They will want the container. may need new gas line and filter too. ask the dealer.

[kidkodger]

I bought a fixer boat and didn't know the condition or amount of fuel in the tank. A lot of people said to use it in my truck but they didn't want it in theirs:cool: I looked into disposal and you have to pay and some places you don't get your containers back.I put a post in the free section of craigslist. I was honest and said unknown age, condition, possibly 50:1 two stroke oil and I was afraid to use it in my vehicles . I said you siphon into your containers and I literally had 17 people ready to come and get the next morning. One guy was near me so I took my boat to him and he did it all. Priceless! Opinions I got were night and day, ones mans junk........

[namu mac]

Take the connector off the motor end of the fuel hose exetd it if necessary. Put he end in a gas can on the ground pump the bulb to get fuel flowing and siphion the fuel into gas cans. If this fuel doesn't have 2 stroke oil in it then you can add it to your car/truck 4-5 gallons at a time. Wait until you're on empty then add 4-5 gallons then fo fill up. I did this a few years ago and used up all the gas. You could tell the difference in the way my truck ran but the gas is gone. You don't need to get the tank completely empty. Then fill with new gas and stabilize it. Don't go out with the doubt that your fuel is going to cause you a problem. A shake down run in the river her would be a good idea.
Ring Free is not a stabilizer.:twocents:

[GearUp]

Thanks all. I appreciate all the input. I like the siphon idea.

Since I was planning on using Sea Foam on the engine I decided to also add a full pint to the 10 gals of gas to help as a general good cleaning for the engine. After I applied Sea Foam through the carbs and into the spark plug holes and ran it off the hose, I took it down to the river and ran the engine. It did great. In fact better than the engine has ever run. I got 5400 out of my Yamaha 115. I have owned the boat for about 8 years with WOT of 5300 being the top. Anyway, I burned most of the old fuel up. I feel great that the motor is working good.

Thanks again everybody,
Chuck