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Discussion Starter · #1 ·
I posted a few days ago regarding the movement of my gas tank and had few responses, finally figured it out. The last couple tank fills I had a vacuum release when I opened the tank. The vent must be plugged and is causing a vacuum that distorts the tank... so simple. Anyone know how to clean the vent or where it is ? I'm assuming it's in the cap.

thanks

Ron
 

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It is not in the cap. Check the diagram under the seat for the evap canister hose routing. That will give you some clues. The vent line from the tip over valve/tank vent goes to the center of one end of the canister that has two connections. If you don't have a factory DVD look at the Max parts fiche. This canister is only used in USA bikes. This might give you some clue as to what to do with it.
 

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The tank vent line is on the right side of the bike..There is a coupler under the rear seat where you can take the line apart...

Blow into the line with the gas cap off.. If you can blow thru. You're good.... Just leave that line disconnected and route it down with the battery vent to underneath the bike.. The other line is on the left side. And the coupler is closer to the front seat...
Take that one apart and PLUG the line going to the front..
You have now just performed a canisterectomy...

If the vent (right) side is plugged. You're going to need to pull the tank and see what's up
It might be pinched or plugged somewhere...

If the fuel tank collapses too far it will wreck the fuel level sensor...

Good Luck

John
 

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Discussion Starter · #4 ·
I have a 2008 RT, I'm going to take the vent tube from the tank and join it to the vent/drain tube that comes out of the bottom of the cannister and drains under the bike, then I'll plug the throttle body stub on the left side and the line into the cannister from the tank as well as the line from the cannister to the solonoid. That should isolate the cannister and solve my problem.

Not sure about the wires going to the solonoid, I'll be leaving it all in place just bypassing the cannister.

Any comments ?

thanks

ron
 

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It is probably just me, but I would rather use all that energy to just find the problem and fix it.

At this point you do not even know IF the problem is a vent problem. You described the problem as your gas tank moving around. If that was accurate then and now, I'd still look to see if the 4 mounts are all correct.

When you remove the tank, you have to disconnect the vent hose (and all the other stuff). It is easy to not get it back correctly, especially if you are in a hurry. Beech was right-on in my opinion.
 

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Discussion Starter · #6 ·
Hopz,

I checked the gas tank and it is securely mounted by all 4 bolts and has no movement when I tug on it. When I opened the gas cap the tank went back to normal position so I'm certain its a vacuum issue.

I've effectively by-passed the cannister by re-routing and plugging hoses. Almost positive the cannister was the culprit. Just before I had this problem I had noticed gas on the ground under the overflow hose twice. I have to assume that gas got into the cannister and plugged it since I started having this problem almost immediately after.
I haven't removed any parts from the bike, just bypassed the cannister so it will easily reconfigure back to original if the problem isn't solved. I'll be heading out for a test ride later today once the tupperware is back on.

thanks for everyone's help and comments.


R
 

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That's good news.

Here is a quote about canisters... from an article about R1100xx's... Ours has the same purpose.

"it's purpose is to collect and "recycle" gas vapors by venting some to the atmosphere and burning the rest. If the canister becomes saturated with gasoline from a tank overfill, or from the bike laying on it side for more than a few seconds, this can create an overly rich condition and make the bike run like crap until all the gas is sucked from the canister. "

Perhaps you had an overfill situation?

In any case a good solution.
 
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