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Old 11 November 2014, 16:44   #1
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Can petrol be left in over winter?

I've put away my rib for the winter but still have half a tank of petrol in her. What should I do with it? Suck it all out? Add a fuel stabiliser? Or will it be ok to use next season? Anyone have any advice?

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Old 11 November 2014, 16:53   #2
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A full tank is better than half a tank, and yes fuel stabilizer is good. The less air in the tank the better as it won't let moisture condense on the top and drop into the tank.

You could drain it if it is easy enough, although I doubt you will get all of it.

Better yet, use the boat!

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Old 11 November 2014, 16:54   #3
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Fuel additives for winter
Loads of threads on this subject
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Old 11 November 2014, 17:13   #4
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I've used fuel stabiliser in the past, but normally top-up with fresh fuel the first run of the season and never had a issue
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Old 11 November 2014, 17:26   #5
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If you can sifon it off and send it to me I will dispose of it for you

Just top it up next time out, never had a problem I did but some fuel staberliser but haven't botherd using it for years now!
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Old 12 November 2014, 03:09   #6
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Recently I started my Porsche 928S that made its last trip in 2001.
Had to replace the electric fuel pump first and it took some effort to start, possibly because of air in the fuel lines.
I can confirm however that gasoline after 13 years is still combustible!
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Old 12 November 2014, 04:04   #7
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Yeah, I al;so started a 1972-sish Johnson which afdter the event we worked ut the first fuel was coming up for it;s 10th birthday..... and that was premix!
yes, it smoked like a 40 a day Marlboro* addict on the initial mix, and did run a lot better on a fresh stuff, but I guess after 10 years the premix had propably evaporated enough of the petrol to make it compatible with your avrerage seagull engine!

Back in the more normal world, I also have had no perceptible issues with a few months of storage. Due to the new crew I'll be interested to see how my current stock in the boat burns - it's now been sat for nearly 10 months.

*other brands of alegedly killer adiction are available
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Old 13 November 2014, 09:15   #8
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Modern fuel contains minimum 5% ethanol. This precipitates water when left to stand for a decent length of time, so you end up with a layer of water at the bottom of the fuel tank. The water will also swell and distort nylon tanks (search online for Ducati fuel tank swelling) as nylon absorbs water.
Personally, I would drain it if at all possible.
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Old 13 November 2014, 12:11   #9
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The water will also swell and distort nylon tanks (search online for Ducati fuel tank swelling) as nylon absorbs water.
Well I didn't know that.

Apparently some types of nylon can absorb almost 10% of their own mass in water[1]. I didn't find anything to say how quickly that happens when it's completely submerged though; [1] said 150 days for a 1.5mm thick piece in air at 50% humidity.

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Old 13 November 2014, 12:27   #10
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I've always left the tank half to 2/3 full over winter so I can top up with a reasonable amount of fresh at the start of the season just in case the "old" fuel has deteriorated.

Done this on both internal S/S tank and on 25 litre plastic tanks. Haven't had a problem yet (that's tempting fate)

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