Tank venting problem? - Kawasaki Versys Forum
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post #1 of 16 (permalink) Old 05-10-2018, 12:51 PM Thread Starter
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Tank venting problem?

So my '15 with only 4,200 garage-kept miles was making a loud hum immediately after a ride this morning. I opened the gas cap and heard a "whooosh", and the hum stopped. Sounds like the tank isn't venting properly. Common problem with these bikes?

Is this where the tank vents? Any suggestions on best way to open it up? Not sure how it could have gotten blocked, but the bike did have a previous owner that put the first 1,700 mile on it.

The bike did go from a cool garage to 80+ temps. Not sure if that's a factor. Maybe the fuel was expanding from the heat and air was leaving, not rushing in?

It runs fine, as far as I can tell. No noticeable performance issues.


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post #2 of 16 (permalink) Old 05-10-2018, 12:59 PM
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My 2018 does the same thing, I figured it's part of the regular venting. Interested to know if that's not the case. What octane do you use?

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post #3 of 16 (permalink) Old 05-10-2018, 01:02 PM Thread Starter
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87. The gas that's in there no is 10% ethanol.
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post #4 of 16 (permalink) Old 05-10-2018, 02:30 PM
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Many bikes make a whooshing or whistling noise after shut-down, some are much more noticeable that others. If the venting is restricted, the engine performance should suffer. If it gets bad enough, it'll die and refuse to start until you open the cap.

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post #5 of 16 (permalink) Old 05-10-2018, 03:02 PM
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Mine will do that sometimes. I figured it was pressure being relieved rather than a vacuum in the tank. Maybe the heat from the engine is rising and warming the tank a bit after shutdown? Or residual fuel pressure from the pump?
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post #6 of 16 (permalink) Old 05-10-2018, 04:36 PM
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ALL three of my V 650s do (or DID) that.

Don't worry about it UNLESS you see gas leaking out....
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post #7 of 16 (permalink) Old 05-10-2018, 05:54 PM
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I have that on my 2018 Versys 650. Even with the cap closed I kept hearing a "buzzing/pressure" sound. When I had it at the dealer for the first 600 miles check-up I asked them about it. The mechanic said this is normal.
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post #8 of 16 (permalink) Old 05-10-2018, 07:05 PM
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I had that on my 09....Then i went with a keyless gas cap and never had that issue again. So now i put them on any bike i get.....



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post #9 of 16 (permalink) Old 05-10-2018, 09:16 PM
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with tropical climate here where temp is always 34c , i don't have the problem but its always safe to have the vent line operating properly.
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post #10 of 16 (permalink) Old 05-11-2018, 05:03 AM
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This is normal. This is a one-way vent.

The air can flow from that hole, into the buse then out the pin hole right under the key.
You can test it for yourself with a straw/hose over the cap's buse; you can blow but not suck.

As the tank empties, it must take air. But expanding fuel is common under heat and you don't want it to spill fuel every time your bike in on the side. So the cap is design to hold SOME pressure.

Notice the sprung rim plate pushing the cap's gasket on the tank; this is on springs so that excess pressure can slip pass the gasket. That's most likely what you hear, that or the one-way valve leaking a tiny bit. It can be a hum, it can be a hiss. It's all fine.
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post #11 of 16 (permalink) Old 05-11-2018, 07:52 AM
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2015 650 ABS something running / ignition off

Quote:
Originally Posted by brock29609 View Post
So my '15 with only 4,200 garage-kept miles was making a loud hum immediately after a ride this morning. I opened the gas cap and heard a "whooosh", and the hum stopped. Sounds like the tank isn't venting properly. Common problem with these bikes?

Is this where the tank vents? Any suggestions on best way to open it up? Not sure how it could have gotten blocked, but the bike did have a previous owner that put the first 1,700 mile on it.

The bike did go from a cool garage to 80+ temps. Not sure if that's a factor. Maybe the fuel was expanding from the heat and air was leaving, not rushing in?

It runs fine, as far as I can tell. No noticeable performance issues.
http://www.kawasakiversys.com/forums...hlight=running
So like the above posts it is obvious that this is normal, not wishing to poke fun at myself , but my thread is 2 pages long, I can laugh now, however after owning a 07 Versys and graduating to a 15, something seemed amiss , as the 07 never did it-- so if you need a good chuckle read my old post.
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post #12 of 16 (permalink) Old 05-11-2018, 09:41 AM Thread Starter
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This sound was different than the normal burps and farts I hear coming from my resting bike, but I've since figured it was a one-way valve situation combined with pressure.

Gracias!
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post #13 of 16 (permalink) Old 05-11-2018, 02:14 PM
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Just to pile on, I've got a 2015 and it happens to me too. The first few times I got concerned and "burped" the tank and of course it stopped. So, then I realized it was just the pressure releasing, so it's all good.

Although, I was cleaning the bike Wednesday and starting fiddling with the overflow tube that goes to the bottom of the bike. After massaging it a bit had some water (with probably a few drops of gas) come out. So, it could be the overflow/vent tube is a little clogged too. Not confirmed, but can anyone weigh in on that theory?

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post #14 of 16 (permalink) Old 05-11-2018, 04:33 PM Thread Starter
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This little hole carries away rain water/gas overflow. It sits outside of the cap seal and drains to the tube on the lower left side of the bike. If you're concerned that it's clogged, shoot a generous amount of WD40 into the hole and see if it drips out the bottom. I've successfully unclogged this drain on other bikes by putting compressed air in the bottom to blow the clog out of the top, while covering the fill hole to protect from debris. Not sure if this would work on this model as it looks to have a slightly more complicated setup.


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post #15 of 16 (permalink) Old 05-11-2018, 06:10 PM
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Quote:
Originally Posted by dddd View Post
This is normal. This is a one-way vent.

The air can flow from that hole, into the buse then out the pin hole right under the key.
You can test it for yourself with a straw/hose over the cap's buse; you can blow but not suck.
There's a joke hiding somewhere in there, I'm just too lazy to look for it...
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post #16 of 16 (permalink) Old 05-11-2018, 06:19 PM Thread Starter
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According to this view, that hole does not vent the tank. It helps vent the overflow (rain water) hole.

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