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yamaha says fill the tank to winterize

Old 10-21-2019, 08:09 PM
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Default yamaha says fill the tank to winterize

Yamaha 4-stroke 300. Manual says to fill the tank to 7/8 to lessen condensation. I've got 1/3 of a tank and have added yamaha stabilizer and ring free. i think that's good enough. What say you?
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Old 10-21-2019, 08:11 PM
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Yes, don’t listen to Yamaha, what would they know? You are obviously smarter.
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Old 10-21-2019, 08:12 PM
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I drain mine.... only time I had a problem was the year I didnít.
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Old 10-21-2019, 08:17 PM
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There is not enough moisture in the air inside the fuel tank to be condensed that would cause a problem. Some people fill before winter, some prefer to fill with fresh fuel in the springtime...potato/pa-tah-to, tomato/to-mah-to...
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Old 10-21-2019, 08:17 PM
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Does yamaha make gas tanks?
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Old 10-21-2019, 08:32 PM
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Originally Posted by Bridgeman53 View Post
Does yamaha make gas tanks?
No, they don't make gas either but what does that have to do with their saying keep your tank full. Amazing how all of you geniuses think think you know more than the engineers that design the engines.
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Old 10-21-2019, 08:34 PM
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I fill mine. The only time I had a problem was when I didnít.
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Old 10-21-2019, 08:36 PM
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Doesn't matter.

https://www.yachtsurvey.com/myth_of_...fuel_tanks.htm
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Old 10-21-2019, 08:44 PM
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Originally Posted by stirus View Post
Yamaha 4-stroke 300. Manual says to fill the tank to 7/8 to lessen condensation. I've got 1/3 of a tank and have added yamaha stabilizer and ring free. i think that's good enough. What say you?
Iím a pilot and we fill tanks to keep moisture from building in our tanks
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Old 10-21-2019, 08:44 PM
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Originally Posted by Gary999 View Post
Just read that. Another article talked about gas in the tanks at the fuel docks. Are they worried about keeping them full to thwart condensation? don't think so. I'm fine with my 1/3rd full and I'll make sure my water separator is doing its job.

thanks everyone for the helpful remarks.
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Old 10-21-2019, 08:44 PM
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My father has a late 80's Whaler with twin two stroke 115 Yamahas he bought when they first became available here. He would always fill the tank before winter, then put some additive in and run the tank out in the spring. The same boat is now 30 years old with the original fuel tank and he has never had any issues.
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Old 10-21-2019, 08:44 PM
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Originally Posted by Gary999 View Post
it does. You donít get condensation or rush in a filled tank.
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Old 10-21-2019, 08:47 PM
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Originally Posted by FlyingTexan View Post

it does. You donít get condensation or rush in a filled tank.
the article is clear that condensation is negligible except in the rarest of continued temperature swings. No reason to fill up for winter storage....

not to mention that even a full tank is going to leave the top of the tank exposed to air and that is most of the surface area where condensation is going to form.
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Old 10-21-2019, 08:47 PM
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Originally Posted by stirus View Post
Just read that. Another article talked about gas in the tanks at the fuel docks. Are they worried about keeping them full to thwart condensation? don't think so. I'm fine with my 1/3rd full and I'll make sure my water separator is doing its job.

thanks everyone for the helpful remarks.
The marinas don't worry about water in the tanks because they're not the ones using the gas, just selling it for the same price and the consumer pays for the repairs later..
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Old 10-21-2019, 09:17 PM
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Originally Posted by scflats View Post
The marinas don't worry about water in the tanks because they're not the ones using the gas, just selling it for the same price and the consumer pays for the repairs later..
The notion that a marina would not worry about water accumulating in their fuel supply is absurd. Unless of course their business model is to sell contaminated fuel to customers, in which case the marina would soon find themselves without any return fuel customers.
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Old 10-21-2019, 09:23 PM
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Originally Posted by sjef View Post
No, they don't make gas either but what does that have to do with their saying keep your tank full. Amazing how all of you geniuses think think you know more than the engineers that design the engines.
How about offering up some actual scientific data to support the notion of the potential for moisture condensation in fuel tanks instead of gratuitous statements about how smart engineers may be. After all, engineers or product manufacturers have never been known to suggest absurd CYA measures regarding the care and feeding of their product, right?
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Old 10-21-2019, 09:28 PM
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I was taught either full or empty

I do full because chances are fuel will be more expensive next spring
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Old 10-21-2019, 09:52 PM
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I moved down South to avoid that very problem. No winter, year-round boating ... no need to winterize. But I do like to keep my tank more full than empty, to minimize the risk of condensation when there are wide temp swings at certain times of the year. No idea if it's necessary.
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Old 10-21-2019, 09:53 PM
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Fuel tanks with open vent systems always better left full for storage or complelty empty. Does not matter the type of fuel as the pilot pointed out. Almost impossible to get your boat tank complelty empty without removing it or secondary pump and hand cleaning.

that article is horrible. He claims to never seen a rapid warm up. All i can say he has never seen the sun come up in Texas on a cold morning. We go from 50 to 80 degrees in a day all the time. Non insulated metal barns will rain on the inside all the time from condensation What he fails to mention, or take into account is that the condensation can happen each day. Small amounts accoumalting over time. That is the culpurt, death from 1000 cuts type deal. The average hummidity, temps and boat in direct sunlight all play a part. Would be interesting to see how the author would explain how mold grows in cabins using his example.
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Old 10-21-2019, 11:12 PM
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Originally Posted by sclancy View Post


the article is clear that condensation is negligible except in the rarest of continued temperature swings. No reason to fill up for winter storage....

not to mention that even a full tank is going to leave the top of the tank exposed to air and that is most of the surface area where condensation is going to form.
the article is ignorant. Itís not just the condensation but how the metal absorbs and rusts. Itís also about tank contaminants flaking off as well as how more fuel is capable of absorbing foreign materials.

the great part of ethanol is it absorbs moisture and contaminants. You can run ethanol with 30% water in it.
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