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Old Jun 7th 2018, 03:04 AM   #1
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Gas tank venting, anyone know how this works?

So I had my tank pretty topped off with fuel on my 899 and I also have an aftermarket gas cap, bonamici. Recently I trailered my bike to the track and noticed when I got there that the fuel overflow tube had spit up a bunch of fuel all over the trailer from the underside of the bike. I'm guessing from all the jostling but does anyone know how the tube setup works exactly? I guess I don't know how far to fill up the bike to avoid this in the future or if it's normal.


-Jack
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Old Jun 7th 2018, 05:37 AM   #2
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Originally Posted by JackAttack View Post
So I had my tank pretty topped off with fuel on my 899 and I also have an aftermarket gas cap, bonamici. Recently I trailered my bike to the track and noticed when I got there that the fuel overflow tube had spit up a bunch of fuel all over the trailer from the underside of the bike. I'm guessing from all the jostling but does anyone know how the tube setup works exactly? I guess I don't know how far to fill up the bike to avoid this in the future or if it's normal.


-Jack
Was it a hot day ? Just expansion? Maybe the venting on the cap is not as good as OEM ?
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Old Jun 7th 2018, 06:53 AM   #3
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Glad you mentioned venting. When i changed the cap over the winter, i noticed the oem has some sort of filter piece that makes a rattle sound when you shake it. The new one has nothing like that, just bare bones metal. You think thats the issue? Again, i don't know how the venting and tubing work exactly


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Old Jun 7th 2018, 06:53 AM   #4
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And no, it wasn't a hot day at all.


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Old Jun 7th 2018, 07:10 AM   #5
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Originally Posted by JackAttack View Post
i noticed the oem has some sort of filter piece that makes a rattle sound when you shake it.
Sounds like a typical check valve. That would make sense.
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Old Jun 7th 2018, 01:48 PM   #6
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Gas overflow, anyone know how this works?

Originally Posted by RetardedTiming View Post
Sounds like a typical check valve. That would make sense.


Ok so i looked up check valves and all I see is aftermarket ones they make for dirt bikes. Do I need something like this and install it where the current hose is?And do i need to position it in the upward position instead of down like how the overflow hose is now so it doesn't flood?

https://www.amazon.com/dp/B006R79TX4..._eKAgBbQPQ00B7


-Jack

Last edited by JackAttack; Jun 7th 2018 at 03:01 PM.
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Old Jun 12th 2018, 03:22 PM   #7
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Hi all, any thoughts?


-Jack
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