Should i winterize my boat with a full tank of gas?

Deven Beer asked a question: Should i winterize my boat with a full tank of gas?
Asked By: Deven Beer
Date created: Tue, May 4, 2021 3:52 AM
Date updated: Tue, Jun 28, 2022 5:45 PM


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Marine engine manufacturers and technicians advise storing any boat with the fuel tank almost full, leaving just a little capacity to accommodate expansion of the fuel if the temperature warms.

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So I asked some of my local dealers the following question: “When you winterize a boat, do you put it away with the gas tank full or empty?” MerCruiser and ValvTect Petroleum Products, which supplies the majority of “treated” gasoline to marinas in bulk, recommend that you fill your boat’s gas tank with fuel that contains an ethanol-combative treatment prior to winterizing it.

By Lenny Rudow. October 25, 2018. To winterize your boat's fuel system, follow these simple steps: fill up your fuel tanks, change your fuel/water separator, and add a fuel stabilizer like Techron Marine. Then, run your engine (s) long enough to work the old fuel through, and get treated fuel into all the lines and through the engine (s).

Is it best to store your boat during the winter with a full tank of fuel, or empty the tank? Ray Fernandez of Bridge Marina on Lake Hopatcong explains and an...

Autumn is in full swing, and for those living in cold-weather areas, this unfortunately means the end of the boating season. Boaters who winterize are faced with a question: Should I fill my fuel tanks for winter storage or leave them empty? The answer has generated much debate.

Fill the tank with fresh fuel so it's almost full. Be sure to use gasoline that does not contain ethanol. As you fill the tank for storage, add a marine-specific fuel stabilizer additive. Follow all instructions outlined on the fuel stabilizer product. Next, give the boat a short run on the water to distribute the fuel.

The best advice for storing E-10 in your boat’s gas tank over winter: Keep the tank nearly full. This greatly reduces the volume of moist air that can enter the tank via the fuel tank vent when temperatures fluctuate in the fall and spring.

With the ethanol debate continuing to rage, should you gas up your boat before winterizing or leave the fuel tank empty? If you live in a part of the country that gets cold this time of year and you own a gasoline-powered boat, your mechanic (or whoever it is that does your annual winterization) is probably going to ask you at some point to fill the gas tank to at least 90 percent capacity.

Just got a new Alumacraft 175 competitor and it has a big gas tank. 34 gallons I believe. I won’t go through 34 gallons of gas in a summer with my 75 yamaha. Wondering what the majority of people do for winter storage. Gas tank full or near empty. I was leaning towards filling it up and siphon half of it out to put in a vehicle in the spring.

No issues to report. The "consensus" from articles I have read is to winterize with the tank full but I haven't heard of any issues from those who winterize empty. It is a good feeling to start off the boating season not buying gas for a while when the tank is full at the end.

If you plan to use your boat year-round, and you live in a place where the temperature dips below freezing occasionally, you should winterize systems such as the water holding tank, showers, livewells, faucets and the head system — if your boat has them — and don't use them during winter.

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