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Equipping the Bike - what's the best gear? Anything to do with the bikes equipment, saddlebags, etc. Questions on repairs and maintenance of the bike itself belong in the Brand Specific Tech Forums.
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  • 1 Post By Rebaseonu
  • 1 Post By Big Yellow Tractor

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  #1  
Old 12 Feb 2008
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What is the purpose of long fuel tank breather hose?

I'm wondering why use long breather hose for fuel tank cap, compared to just valve in the cap? Is it just because fuel will leak through the cap valve when doing rough jumps (motocross etc)? Most aftermarket tanks come with long hoses.
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Old 17 Feb 2008
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The hose is used on better tanks equiped with non vent caps to direct any gas spalshover. Any cap that can let air in may let gas out on top of your tank. And with a hose you can direct the gas splash to a catch tank to keep it off the ground. Safer for you and better for the enviroment and your garage floor. Cheers, WCH
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Old 17 Feb 2008
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my breather hose leads inside my steering head, I find it good because no dirt can get in and also if I forget to put my cap back on after filling up petrol then it just hangs there.
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Old 17 Feb 2008
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Mine has a little alloy one-way valve on about an inch of pipe. I fitted this after crashing and getting pinned under the bike with petrol peeing out of the breather hose, all over my chest.
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Old 30 Oct 2008
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If (when) the bike falls over

AND

the end of the breather hose is below (now above [bike is inverted]) the bottom (now the top) of the fuel tank .. no fuel will spill out .. thus you don't loose fuel.
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Old 30 Oct 2008
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It's also handy as a spare length of fuel pipe from the tap to the carb if the original ever gets damaged... and depending on length could be used to syphon too...

xxx
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Old 30 Oct 2008
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And for enemas.
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Old 31 Oct 2008
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Quote:
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And for enemas.
Now your farts must light up really well!!!
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Old 31 Oct 2008
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The long vent hose is usually directed down to the road and away from hot exhaust pipes, cylinders, and away from your crotch (which to me is the most important part of my body). The tanks have to vent to allow for the expansion of the fuel and the ingress of air - if no air can get in you'd get a vacuum forming inside the tank and no fuel would gravity feed to carbs/injection system after a few kms.
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Old 28 Dec 2008
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The one coming out of the filler cap is great for refilling your fuel lines after draining (very useful with Acerbis tanks) ... you do this by blowing down it
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