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Old 09-24-2006, 01:28 PM
Turnandburn Turnandburn is offline
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Leave gas tank empty or full during winter?

I'm a newbie and own a 2006 Prostar 197. The MC owners manual recommends filling the gas tank and treating gas with Stabil for winter storage. Which method is best running the tank down and treating the residual fuel so fresh fuel can be added in spring or having a full tank in spring with 6 month old treated gas?
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Old 09-24-2006, 01:49 PM
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countymountie countymountie is offline
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The past recommended practice of filling the tank was was to prevent condensation due to the use of "metal" gas tanks. Now that that the tanks are made of plastic polymers, condensation is no longer an issue. I got this little tidbit from my service manager.

The less gas I leave in the tanks is less gas I have to treat with stabil.
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Old 09-24-2006, 02:10 PM
TMCNo1 TMCNo1 is offline
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Condensation can still be a problem, but not as severe. Fill it up, treat it, it's cheaper than replacing water seperator filters, and fuel system components if it should happen when someone said it wouldn't. Especailly when they will be doing the trouble shooting and the repairs at your expense.
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Old 09-24-2006, 03:54 PM
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P-hat_in_Cincy P-hat_in_Cincy is offline
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Ethanol can play a factor...

I've been reading about how ethanol has an effect on this. Apparently, ethanol attracts water. I've been reading that it's actually best to drain your tank as low as possible as this characteristic of ethanol can cause gumming of engine parts is too much water is pulled into the mix.

Anyone know if MC's more recent manuals take into account the effects of ethanol?
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Old 09-24-2006, 04:23 PM
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then don't use ethanol. I always put in the amount of stabil, then fill it up, run the boat for about 10 minutes, then on the trailer for winter when it's time.
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Old 09-24-2006, 05:54 PM
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I always make sure that the last tank I use is ethanol free, and I add stabil at the proper amount. Cost's a little more, since all the ehanol free gasonline around here is premium grade, but it's worth it when it starts up next spring.
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Old 09-24-2006, 06:57 PM
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countymountie countymountie is offline
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Quote:
Originally Posted by TMCNo1
Condensation can still be a problem, but not as severe. Fill it up, treat it, it's cheaper than replacing water seperator filters, and fuel system components if it should happen when someone said it wouldn't. Especailly when they will be doing the trouble shooting and the repairs at your expense.
That's what my water/fuel filter is for. I change it out annually.
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Old 09-24-2006, 11:48 PM
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Jonathan94 Jonathan94 is offline
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The way I also look at it is .... what is the likelihood gas will be more expensive come springtime when the boat is going to go back in the water? Past experience has shown me it is likely cheaper to fill it now and add the Sta-bil then to wait until spring and fill the tank then.
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Old 09-25-2006, 08:46 AM
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Workin' 4 Toys Workin' 4 Toys is offline
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Personally I prefer 1/2 tank for storage. Leaves room for fresh fuel when the time comes....Regardless of fuel additives.
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Old 09-25-2006, 09:04 AM
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So apparantlly there's no cut and dry right answer? I plan to keep mine filled with Super grade and add stabilizer.

My boat mechanic said that stored gas will lose about one octane per month. He recommends keeping the tank about 1/4 full with Super and then filling with super again in the spring. He readily admits it's his own theory and has nothing to back this up. Anyone else heard this?
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