Solved problem with gas tank, but still curious - Wrist Twisters
 
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post #1 of 8 Old 01-06-2013, 09:31 PM Thread Starter
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Solved problem with gas tank, but still curious

Earlier this year, I replaced the gas tank on my 2006 9'er. I did not notice that, despite my best intentions, I had received a shiny new non-California tank. No big deal, except the gas cap does not have a vent feature. Somehow, i made it for months only getting a little vacuum or pressure on the tank.

Well, lately the problem got bad enough to make me really worry for the tank, and I figured out the above situation. I took the gas cap apart and provided a tiny hole to allow the tank to breathe, and the vented gas goes through the same little port on the side that was (almost) provided to do so.

Now my question is, what does the seal look like that goes between the top of the tank and the non-California gas cap? Online catalog drawings are too crude to see how it all works.

If someone could (please?) post a few pics of the top of the tank (cap open) and the underside of the stock cap, that would be really, really useful.

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post #2 of 8 Old 01-06-2013, 10:11 PM
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Do these help? I can take more if you need them.




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post #3 of 8 Old 01-06-2013, 10:17 PM Thread Starter
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Do these help? I can take more if you need them.


Hmm. Need a bit more light on the filler neck pic. On the cap i see the little tab with the rectangular hole. That is the vent hole i think. It should interface with a seal of some kind according to the parts catalog. Btw thanks for the pics so far.

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post #4 of 8 Old 01-06-2013, 11:23 PM
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It looks to me like the small rectangular hole just outside the gas cap seal routes to the sealed part of the cap facing the interior of the tank. I think the small hole next to the filler neck in the first photo drains to the charcoal canister (or in my case pavement).

The way I see it the sealed part of the gas cap vents to the unsealed part and any fuel that makes it out drains off.

And then I re read your first post and realized you were asking about a non California bike .

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post #5 of 8 Old 01-07-2013, 05:41 AM Thread Starter
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Quote:
Originally Posted by Niner View Post
It looks to me like the small rectangular hole just outside the gas cap seal routes to the sealed part of the cap facing the interior of the tank. I think the small hole next to the filler neck in the first photo drains to the charcoal canister (or in my case pavement).

The way I see it the sealed part of the gas cap vents to the unsealed part and any fuel that makes it out drains off.

And then I re read your first post and realized you were asking about a non California bike .
yeah, the Cali bikes are different.

So, anyone with a NON-CALIFORNIA bike, please post a few pictures.

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post #6 of 8 Old 01-07-2013, 11:39 AM
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I can take a video when I get home, but for now, see if the video below helps at all. I swapped key tumblers in the gas caps between my 919 and my wife's 599, and noticed that although very similar, the caps had different parts (and a vent hole, I believe) between the two.

How to swap keys in a Honda Gas Cap 919 or 599 - YouTube

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2006 Honda 599 - Ex wrecked it :-D
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post #7 of 8 Old 01-07-2013, 02:17 PM Thread Starter
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Yes that did it!
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File Type: jpg 919_GASCAP.jpg (79.4 KB, 39 views)

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post #8 of 8 Old 06-07-2015, 06:48 PM
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have anyone ever taken that vent valve apart? Is it venting straight to the atmosphere or there is some sort of ball/spring that reacts to the pressure or vacuum?

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