K1200S Fuel Tank Venting - K-Bikes.com - Excellence in Motion
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post #1 of 5 (permalink) Old Jun 5th, 2008, 6:53 pm Thread Starter
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K1200S Fuel Tank Venting

I've recently noticed that my K1200S will build up a negative pressure (vacuum) in the fuel tank. In fact, the bike has actually stalled twice, but starts immediately, once the cap has been opened, thereby venting the tank to ambient. This is the second K1200S I've owned, and I don't remember this characteristic before. Is the tank vented to ambient and is a negative pressure normal, or is the vent pluged? I should add that the problem is made worse by having the tank full, which one would expect as the air volume is decreased. Any thoughts?
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post #2 of 5 (permalink) Old Jun 5th, 2008, 8:51 pm
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Location: Chicago, IL, USA
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Check the hose off the top of the tank behind the fuel cap is not pinched. It should end under the bike around the sidestand.
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post #3 of 5 (permalink) Old Jun 7th, 2008, 2:18 pm Thread Starter
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Thanks, I'll check it today.
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post #4 of 5 (permalink) Old Jun 9th, 2008, 7:59 pm
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Location: Ann Arbor, MI, USA
Posts: 28
Was the airbox replaced? I had the same symptom (vacuum in the tank) after my shop replaced this part. It turned out that they inadvertently pinched the breather tube from the tank. It is an easy fix, and you should spot the problem as soon as you remove the plastic around the fuel cell. The breather tube runs down the left-hand side, between the battery case and fuel cell.

good luck


2005 K1200S (Awsome!)
2002 R1150RT (nearly perfect)
long impatient pause....
1976 Honda CB750K
1972 Yamaha 350 R5-B
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post #5 of 5 (permalink) Old Jun 10th, 2008, 11:58 am
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Yep. Me too. I fixed mine myself by taking the plastic off and moving the tank around until I could free the vent hose. See original link here: http://www.k-bikes.com/forums/showthread.php?t=13696

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