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Old 06-02-2012, 12:46 PM   #1
Twin-shocker OP
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Ducati fuel tank problems?

Not heard of any problems with Ducati tanks here in the UK, and wonder whether issues in the US related to problem tanks have now been resolved?
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Old 06-02-2012, 02:18 PM   #2
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Legally resolved, argueably yes. Technically resolved, emphatically nooooo See it all here:

http://www.ducatimonsterforum.org/in...?topic=43639.0

http://www.ducatimonsterforum.org/in...?topic=25074.0
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Old 06-02-2012, 02:45 PM   #3
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Thanks...............had a read of that, and it seems astonishing that people with Ducati's are needing to put ridiculous tank sealers into their tanks, which seem to me clearly not to be fit for purpose?

What would happen if Ford or GM sold cars with defective fuel tanks I wonder?
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Old 06-02-2012, 05:26 PM   #4
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The tanks are made by Acerbis. They are made of nylon. I haven't had any problem with mine, which is over 2 years old.

However, I removed the carbon canister and replaced the original fuel filler with a competition version that has no valving in it. This prevents any tank pressurization, something that I believe contributes to the tanks swelling. The vent is open to the atmosphere. I also try to keep the tank out of direct sunlight by covering it with a jacket when it has to be parked in the sun.
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Old 06-03-2012, 12:23 AM   #5
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Is it legal to remove the emissions equipment in all US states I wonder? I get the feeling that the PA6 nylon absorbing water has a lot to do with the problems that are occurring, and not heard of any issues on other bikes with HDPE tanks, that are generally fitted with covers.
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Old 06-03-2012, 04:47 AM   #6
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Quote:
Originally Posted by Twin-shocker View Post
Is it legal to remove the emissions equipment in all US states I wonder? I get the feeling that the PA6 nylon absorbing water has a lot to do with the problems that are occurring, and not heard of any issues on other bikes with HDPE tanks, that are generally fitted with covers.
Every state is different as far as inspections and what they check for. My state, ohio, has no inspection at all unless you buy the bike from a different state, then they just check the VIN number.

My XR isn't even close to legal, but they gave me a plate for it because I told them it was legal.

I don't think, however, any state inspector would check the fuel tank. Most states seem to be somewhat relaxed about motorcycles, but really crack down on cars and trucks. California is the worst, I've heard tons of stories about people jumping through hoops to keep their cars on the road.
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Old 06-03-2012, 06:34 AM   #7
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There was a similar issue with Speed Triples over here (everywhere?) due to the factory sometimes assembling the "pollution valve" backwards which would cause the tank to implode (tank was OK... until implosion, of course). I thought the Euro-Zone had pretty much similar pollution standards to the US by now. Live in California, probably strictest state, never had any bike here seriously scrutinized.
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Old 06-03-2012, 11:20 AM   #8
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Removing the emissions parts may well mean fewer tank problems then..............seems strange that someone has not come up with a kit to help with this, as I get the feeling that removal might well help?
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Old 06-03-2012, 01:09 PM   #9
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Originally Posted by Twin-shocker View Post
Removing the emissions parts may well mean fewer tank problems then..............seems strange that someone has not come up with a kit to help with this, as I get the feeling that removal might well help?
Competition style filler cap assemblies are available for just about any motorcycle. Some OEM caps can be modified to eliminate the valve. The rest is simple. Remove canister, extend tank vent line, plug or cap off vacuum purge line.
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Old 06-03-2012, 01:31 PM   #10
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I haven't read anything that would point to tank venting being the issue. I'd be up for about anything that would help though. My tank has ripples in the knee pockets and the top triple contacts the tank at full lock on both sides.
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Old 06-03-2012, 01:49 PM   #11
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I haven't read anything that would point to tank venting being the issue. I'd be up for about anything that would help though. My tank has ripples in the knee pockets and the top triple contacts the tank at full lock on both sides.
Water and alcohol tend to soften nylon. Pressurizing the fuel tank can expand softened nylon. Consider a 6 inch square area on a tank. That's 36 square inches. At 1 psi, you have a total force of 36 lbs. At 2 psi, the force is 72 lbs.

Figure out the total surface area of the tank and multiply by the psi that the valve is set for. It's not inconsequential.
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Old 06-03-2012, 09:57 PM   #12
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Pressurised plastic tank is certainly going to expand quite a bit, and I would guess may in some cases mean the tanks actually going to start leaking. Seems a great opportunity for someone in the US to come up with a easy fit of parts to stop tanks pressurising? Ducati owners even seem to be trying tank "sealers" which may well result in need for new fuel pumps when they fail..................
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