New Tank Not Venting - Wrist Twisters
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post #1 of 9 Old 08-10-2020, 08:07 PM Thread Starter
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New Tank Not Venting

Have 73K miles on my 06' 919. Been running like a champ. Needed to replace the tank due to tip over damage. Bought a new OEM tank and got it installed with minimal issues.

However... the tank is not venting correctly. I've checked for pinched vent and overflow lines and both seem free and clear.

My question - is there a mechanical vent valve in play? Or what else should I be checking? Everything I've looked at seems OK - but not having any luck with this problem.

And prior to replacement - there were no venting issues.

Appreciate any suggestions.


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post #2 of 9 Old 08-11-2020, 07:48 AM
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My first question would be what are the symptoms and are you sure they're caused by it not venting?

Second question would be how you've checked the vent lines and made sure they weren't pinched.

I'm almost certain there's not valve anywhere in there, the only thing I can think is maybe there was a plug (or manufacturing defect/overspray/something else issue) blocking the vent from the factory.

Two easy tests I'd try: Try removing the hoses completely from the tank (just the vent and overflow ones) this will allow the tank to vent directly out of the nipple and completely remove a pinched hose from the equation. The second thing I'd try is blowing through the vent hose while its attached. This will show whether or not there's an obstruction in the vent line somewhere and at least help you move forward with remedies.
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post #3 of 9 Old 08-11-2020, 08:34 AM
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Quote:
Originally Posted by badmoon692008 View Post
My first question would be what are the symptoms and are you sure they're caused by it not venting?

Second question would be how you've checked the vent lines and made sure they weren't pinched.

I'm almost certain there's not valve anywhere in there, the only thing I can think is maybe there was a plug (or manufacturing defect/overspray/something else issue) blocking the vent from the factory.

Two easy tests I'd try: Try removing the hoses completely from the tank (just the vent and overflow ones) this will allow the tank to vent directly out of the nipple and completely remove a pinched hose from the equation. The second thing I'd try is blowing through the vent hose while its attached. This will show whether or not there's an obstruction in the vent line somewhere and at least help you move forward with remedies.
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post #4 of 9 Old 08-11-2020, 10:04 AM Thread Starter
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Thanks for the input. The tank has suction after my commute to work. I can open the gas lid - but it's difficult and the vacuum is there. At least I know I don't have any leaks in the tank.

I've inserted a wire into the small vent tube under the gas lid and didn't get resistance until the pipe turn. Haven't tried to go further.

QUESTION: Am I correct to assume that the smaller diameter tube coming off of the tank at the bottom is the vent tube? And the larger is for overflow?

If that is correct - I'll disconnect that tube and see if I can get air through it.

QUESTION: Is there a rubber seal for the small tube that rises slightly inside the gas filler bay? I see that there appears to be a hole in the cast aluminum body of the gas cap that aligns to the small tube. Just wondering if I missed a part in the tank swap?


Temecula, CA (So Cal)
06-919

Too often we lose sight of life's simple pleasures.
Remember when someone annoys you, that it takes 42 muscles in your face to frown ...
But it only takes 4 muscles to extend your arm and bitch-slap that mother- upside the head...

Pass it on.
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post #5 of 9 Old 08-11-2020, 07:08 PM
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Just a quick thought, that hopefully someone else can elaborate on because I have no direct experience. Aren't the California tanks different in their venting than the others? Is it possible you have the wrong gas cap type for the tank that you bought?

Edit: found a thread that talks about it.

https://www.wristtwisters.com/forums...d.php?p=535783

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post #6 of 9 Old 08-11-2020, 07:18 PM
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Quote:
Originally Posted by Superdog View Post
Just a quick thought, that hopefully someone else can elaborate on because I have no direct experience. Aren't the California tanks different in their venting than the others? Is it possible you have the wrong gas cap type for the tank that you bought?

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Good catch!
Yes they are different.
Bonafide Cali' 919s don't vent to atmosphere and instead vent to an Evap(orative Controls charcoal) Canister slung below the bike in a spot the precludes the fitting of a centre stand.
There is a solenoid valve involved with this design.
This all came up earlier this year in another thread.
I think the tanks in isolation are common, but how they are vented are not.
The manual shows two schematics on pages 1-34 & '35.

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post #7 of 9 Old 08-11-2020, 07:24 PM
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IF the bike is a bonafide Cali' 919, then see this thread for some nuances about same re the Evap system as includes extra connections at the throttle bodies, and not just tubes from the tank to the evap can.
You'll have to sift a bit to find that content, suggest you start with post #25 then hunt above and below from there.

https://www.wristtwisters.com/forums...oad-81511.html

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post #8 of 9 Old 08-12-2020, 08:28 AM Thread Starter
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Tank is a Cali model and my gas cap is Cali model - unless the factory messed up. I removed my evap canister shortly after buying the bike - per suggestion of several threads on this site (long time back).

Didn't get time to check the hose last night - but should have time tonight.


Temecula, CA (So Cal)
06-919

Too often we lose sight of life's simple pleasures.
Remember when someone annoys you, that it takes 42 muscles in your face to frown ...
But it only takes 4 muscles to extend your arm and bitch-slap that mother- upside the head...

Pass it on.
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post #9 of 9 Old 08-15-2020, 03:59 PM Thread Starter
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Checked the tank vent and it was clear from the top to bottom. (from tank filler area nipple all the way to the bottom of the end of the vent tube)

So the issue must be with the tank lid. The seal closes off the tank - so guessing that there is a simple bypass within the tank lid. Haven't found any schematics for lid - so pondering the possible issues... I did see a video of someone pulling one apart to replace the key tumbers... so that may give me some clues. But doesn't explain what could have changed during the tank swap?!?

Will continue to troubleshoot - but in the mean time - just popping the filler lid when I make a stop. No major temperature swings in SoCal - so not too worried about caving in then tank...


Temecula, CA (So Cal)
06-919

Too often we lose sight of life's simple pleasures.
Remember when someone annoys you, that it takes 42 muscles in your face to frown ...
But it only takes 4 muscles to extend your arm and bitch-slap that mother- upside the head...

Pass it on.
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