Should i leave gas in my boat over winter?

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Sofia Hoeger asked a question: Should i leave gas in my boat over winter?
Asked By: Sofia Hoeger
Date created: Sun, May 9, 2021 7:11 PM
Date updated: Sun, Jul 3, 2022 10:10 AM

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Top best answers to the question «Should i leave gas in my boat over winter»

Mandated by the Renewable Fuel Standard, this fuel could “phase separate” over long winter storage periods and harm boat engines and fuel systems. If you have a portable gas tank on your boat, try to use as much gas as possible before you put the boat away at the end of the season.

Experts in the fuel industry now recommend storing the tank at 90 percent of its capacity (the safe fill level) to minimize the potential for condensation and to allow for expansion… In addition to a nearly full tank, it is also highly recommended that a stabilizer be added to the fuel prior to prolonged storage.

Filling the Tank

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… The tank “breathes” though its vent, and draws in air that is often very damp in the winter months.

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The idea is to provide relevant information related to leaving gas in the boat during the winter season. The answer is YES. One can leave gas in the boat during winter. However, fuel treatments must be added to maintain gas quality.

Be careful not to over-fill the fuel tank, and leave enough room for expansion when the weather warms up. But at the same time, do not cap any fuel tank vents. While you want to minimize the possibility of condensation, if the fuel tank can’t breathe expansion damage can occur. Shut off the fuel valve at your boat’s tank, if it has one.

Re: How much gas do you leave in your boat over the winter? I disagree with the statement that fuel now is more stable than of earlier years.

In all my reading (sorry no links) from my job (auto mechanic/small engine repair shop owner) the oppsite is true.

It is true that the blends (additive packages) are better, but the stability (aka shelf life) is less (as is the octane rating).

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.

Gasoline bought at land-based stations remains stable for no more than 90 days before it breaks down. Because water is heavier than gasoline, it sinks to the bottom of a boat’s gas tank. Come spring, when you start your engine and the fuel pump starts drawing what is supposed to be gasoline, it’s sucking in the water.

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 any fuel, an antioxidant (found in many additives) will help keep it fresh during lay-up.

If a boat is stored out in the most extreme temperatures this may be more crucial with how the fuel is handled. My boat is in an insulated attached garage that stays 30-45 degrees all Winter regardless of temperature outside. I’ve never had an issue whatsoever come Spring.

Non ethanol gas should be topped off to full tank to eliminate room for condensation. Ethanol blended fuels ideally should be stored empty or as close to empty as possible as the ethanol actually binds water molecules to it and can cause phase separation which can cause issues...

For the last 2 years I've filled my boats gas tanks with gas, Stabil, and Seafoam, then fogged the engine with Seafoam Fogger and been done with it. It was stored in an unheated garage. Haven't had a problem yet. This year I'm storing it in a heated garage. My friend said that I should run all of the gas out of the lines before I store it. I've ...

Keeping gas in your tank over a long period of time is a cause for concern. There are some actual chemical changes that happen to gasoline over time, but some issues can be fixed with a fill-up of fresh gas. Make the best plan for the least amount of fuel damage. Adding a fantastic product like STA-BIL® Fuel Stabilizer will help keep your fuel ...

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