Tank spreading in Europe / Germany - Page 11 - Ducati.ms - The Ultimate Ducati Forum
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post #101 of 106 (permalink) Old Jul 11th, 2011, 11:42 am
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I read a report by a technical guy, who said that the problem is not caused by ethanol itself, but the water created by phase seperation. Apparently, water is absorbed by nylon, which softens it. Nylon also gives up it's water freely, so if a swollen tank is allowed to dry out, it will return to it's original shape.

So, how do we prevent phase separation taking place?
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post #102 of 106 (permalink) Old Jul 11th, 2011, 1:50 pm
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So if a swollen tank is allowed to dry out, it will return to it's original shape.
Maybe . . . but don't hold your breath.

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So, how do we prevent phase separation taking place?
I tried an additive that the boating industry recommends to prevent phase separation. It didn't do much. The tank still expanded. The only thing that worked for me was to have the tank coated.

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post #103 of 106 (permalink) Old Apr 26th, 2012, 3:33 pm Thread Starter
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May I resurrect this old thread? Sure ...

Concerning the differences between version A and B of the tanks, I did some measurements at the time when I was dealing with this issue, which I didn't report back then.
Today I ran out of gas with the low-fuel digital odometer showing 56 km.
Before swapping the tank version A with the version B + Caswell, I had consistently determined that while driving fuel-efficient, I was able to run on reserve for at least 70+ km. Once I even ran as much as 85 km before finally finding a petrol station
Anyhow ... this brings me to the measurements I did last year ...

The GT tank should hold 15 l out of factory (specs). My old tank, version A, could be filled up from fully empty, with the bike in vertical position, with 14.5 l. After Caswell-ing my second tank, version B, I did the same measurement and came up with 13.25 l. When I coated the tank, I measured the volume of Caswell I poured into the tank, then subtracted the amount that dropped out of the tank after having sloshed it around, so I know that I distributed into the tank 0.25 l of Caswell. This means that the original new-from-factory version B tank holds 13.5 l fuel ... 1 l less than version A. That correlates well with the difference in weight between the two versions. I measured roughly 1.1 kg in weight difference (version B - version A). With the density of PA being around 1.15 g/cm³ the weight difference should reduce the internal volume by around 1 l; as the external shape is the same between the two versions.

So this undermines the theory that version B was a short-term answer (which might very well turn into a long-term "fix") for tank-spreading issues in Europe. More material means thicker walls, thus more rigidity against deformation.

I think that the bottom part of the tank receives much more additional material, thus reducing inner volume of the lower part of the tank more than the upper part. This might be on purpose ... the lower parts of the tank are obviously in contact with fuel nearly always, as opposed to the upper part of the tank, which is only in contact with fuel when you have just filled up. This also explains, why the "loss" of internal volume between my first tank and my second tank substantially reduces the distance I can now drive once the low-fuel light goes on.


/Simone

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post #104 of 106 (permalink) Old Jun 5th, 2012, 2:36 am
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Hi Simone,

I just bought my SC1000 06 3 weeks ago. I am worried that Ducati will not replace my tank, because the bike its already 6 years old. Although I bought it with no KM. Should I coat the original tank or wait for it to spread? As I heard that I will get no replacement it is coated. I am a little confused here...
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post #105 of 106 (permalink) Old Jun 5th, 2012, 7:36 am
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Hi Simone,

I just bought my SC1000 06 3 weeks ago. I am worried that Ducati will not replace my tank, because the bike its already 6 years old. Although I bought it with no KM. Should I coat the original tank or wait for it to spread? As I heard that I will get no replacement it is coated. I am a little confused here...
They will. Read here:
Tank Replacement post-Class Action Lawsuit

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When asking a Ducati owner if he had any problems with his bike, his response was:
"The only problem I've had is attractive women divesting themselves of their clothing and rubbing their naughty bits on my leg while they lick the gas tank. Makes it hard to pull away from a red light,...... sometimes."

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post #106 of 106 (permalink) Old Jun 5th, 2012, 7:59 am
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Actually, I have pretty much the same question; I'm in Asia and the 3rd owner of a GT1000 (2009 model) with over 25,000 miles. "If" the tank spreads (I believe ethanol isn't an issue here), can I get a new one? I was under the impression the lawsuit was only for the US.
-David
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