Vacuum issues in gas tank - 600RR.net
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post #1 of 9 (permalink) Old 05-14-2012, 05:00 PM Thread Starter
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Vacuum issues in gas tank

Hello, a couple of days ago my mechanic had my valve clearance checked.
Since then i noticed every time i try to open the tank cap after some miles of riding that a vacuum is generated.

I never had this problem before and i know this should not happen. Is there a tube that allows air to flow in the tank or there is a valve in the cap of the tank ? What should i check ?
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post #2 of 9 (permalink) Old 05-14-2012, 05:01 PM
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Quote:
Originally Posted by Alarm View Post
Hello, a couple of days ago my mechanic had my valve clearance checked.
Since then i noticed every time i try to open the tank cap after some miles of riding that a vacuum is generated.

I never had this problem before and i know this should not happen. Is there a tube that allows air to flow in the tank or there is a valve in the cap of the tank ? What should i check ?
there are two tubes coming off your tank (under it)

you will need to remove the tank cover, and pull back the fuel tank to get to them

one of them is kinked and preventing the vent form working properly.


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post #3 of 9 (permalink) Old 05-14-2012, 07:46 PM
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Quote:
Originally Posted by tenjin View Post
there are two tubes coming off your tank (under it)

you will need to remove the tank cover, and pull back the fuel tank to get to them

one of them is kinked and preventing the vent form working properly.
Make sure you get that fix before your tank gets sucked in


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post #4 of 9 (permalink) Old 05-15-2012, 03:31 AM Thread Starter
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Is there maybe a diagram to understand which tube you mean ?
I remember that there is a big one on the left side but it does not go in the tank but it goes straight up to the tank cap if i am not mistaken.

Furthermore, as i drove like 1000km since then, could something get damaged by this ?

Last edited by Alarm; 05-15-2012 at 03:42 AM.
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post #5 of 9 (permalink) Old 05-15-2012, 12:13 PM
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just pull the tank back, you cant miss it

you have id'ed one of the two already ;)

and not likely, BUT if its allowed to pull sufficient vaccume, it WILL crush your tank like a soda can, happened to a member on here last year.


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post #6 of 9 (permalink) Old 05-15-2012, 05:10 PM Thread Starter
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I checked the service manual today and saw that there is also a sensor there, writing also a procedure. To be honest i did not understand what are those steps.

Could be something wrong with the sensor ?

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post #7 of 9 (permalink) Old 05-15-2012, 07:32 PM
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Thats the MAP sensor Unless you having other problems with the bike since the work was done forget about that.

There are three rubber pipes that are supposed to exit the lower fairing/ bellypan right infront of the kickstand. Two bigger pipes and one small one.
The two bigger pipes are what you need to check one is for the filler overflow (Not the problem) the other is the tank vent. Trace the two pipes upto the tank making sure theyre not pinched or kinked anywhere.

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post #8 of 9 (permalink) Old 05-16-2012, 01:33 AM Thread Starter
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Ok, will do so today. Thank you for your information.
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post #9 of 9 (permalink) Old 05-17-2012, 02:12 AM Thread Starter
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Ok , i believe its fixed. The vacuum hose was kinked.
I just hope that this did not cause any problems to the pump.
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