Tank sucking in - MVAgusta.net
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post #1 of 19 (permalink) Old 07-28-2015, 07:08 PM Thread Starter
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Tank sucking in

Hot day, driving to work, look down and notice the tank is sucking inward just ahead of the fuel cap on my 2014 B800.

Get to work, open the tank and hear air suck and the tank goes back to the normal shape.

I called the dealer and he suggested a plugged vent tube.

Anyone else had this? Where is the vent tube? Charcoal canister?
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post #2 of 19 (permalink) Old 07-29-2015, 02:09 AM
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Not 100% sure but i think the vent tube runs behind the engine between the frame plates. Then it runs down to the rear brake lever.
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post #3 of 19 (permalink) Old 07-29-2015, 05:37 AM
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You're in the USA?? Then the tank vents through a carbon canister. The carbon can gets air in through a vent on the side or bottom of the tank which may or may not have a hose attached (I don't have familiarity with the 3 cylinder bikes yet).

The dealer is right, your tank is not venting. Steel F4 tanks have been known to cave in permanently from plugged vents....so have Suzukis, Hondas, etc etc etc.

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post #4 of 19 (permalink) Old 07-29-2015, 06:41 AM Thread Starter
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Canada, in fact, but the canister is the same.

While fiddling around last night I noticed there is a crude chart on the underside of the seat that shows the venting plumbing and direction.

Now just have to find the blockage! Ugh.
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post #5 of 19 (permalink) Old 07-29-2015, 11:12 AM
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My 2015 F4 did the same thing sort of. When hot it would expand like a balloon and blow cap open a soon i turn key to open for fuel. Then i noticed after i got fuel and ran the tank low and bike cooled down in garage it would suck in badly. It creased the tank. This was all in about 2 weeks. Bike was only 2 months old. Warranty got me a whole new tank but i was told it was venting issue through evap canister.
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post #6 of 19 (permalink) Old 07-29-2015, 03:00 PM
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Don't overfill those tanks!!! The evap can will get contaminated and the charcoal will lump up and block the system causing all kinds of havoc.

An evapectomy is the best solution. I guess the North American market are all getting Kalifornia spec bikes now (evap system only required in that state). Makes sense from a inventory management point for a small volume company like MV.

Farmer, this should be a warranty issue. In the USA we have a Federal Emissions Warranty that covers components for 5 years or 30,000 kM. Maybe Canada has something similar?

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post #7 of 19 (permalink) Old 07-29-2015, 03:18 PM
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I second the evapectomy.
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post #8 of 19 (permalink) Old 07-29-2015, 03:34 PM
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Originally Posted by Poliziotto View Post
I second the evapectomy.

Don't you have to uphold the law?

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post #9 of 19 (permalink) Old 07-29-2015, 04:22 PM
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post #10 of 19 (permalink) Old 07-30-2015, 05:56 AM
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Don't you have to uphold the law?
Not when you can selectively apply it to your own ends....

"It's more like a guideline ...."

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