OzSTOC
Honda ST1100 Section => Fuel & Fuel Additives ST1100 => Topic started by: Bikebear on August 29, 2012, 08:39:31 PM
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Just wondering if when you open the fuel cap on your ST it whooshes like it's pressurised. The cap has a vent hose attached but it doesn't seem to release the pressure. Anyone got any thoughts.
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They all do it,
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They do all whoosh, but it is a known issue where the cap does not allow air into the tank once it runs lower. (Having pressure in the tank is normal due to controlling petrol vapour emissions - the whoosh should be release pressure, not letting air in due to a vacuum) One way to tell is if the bike runs better after releasing the cap, and runs worse with it on going for a while before releasing it. The vacuum builds up counteracts the pump trying to get petrol out. You can take the cap apart and make sure it is working ok - I have a diagram somewhere about how it works if you need it. Mine makes lots of noises it hot weather as the pressure in the tank is vented.
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about 2 weeks ago i heard a buzzing sound after a short ride on hot day that could be heard several meters away . took time to track down but ended up a pressurised fuel tank. been meaning to quiry this as ive never had that happen before.
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It's not so obvious with a full tank as the air space above the fuel is smaller. Less air to heat up, expand and escape.
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And here is a diagram on how it works. The ST13 probably has a more car like system with a closed loop.
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"learning everyday"
I always thought that noise was my radiator cap letting off a bit of steam that's why???? well on my bike anyway, the noise stops and starts :think1
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The noise does stop and start, as the bikes residual heat expands the petrol/air in the fuel tank. Sounds a bit like whale noises on a hot day, as the pressure is relived first time, then a while later when it builds up.
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I thought it was my 1100 humming to itself because it had enjoyed the ride too. :whistle
:bl11
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The noise does stop and start, as the bikes residual heat expands the petrol/air in the fuel tank. Sounds a bit like whale noises on a hot day, as the pressure is relived first time, then a while later when it builds up.
Thanks mate :thumbsup was actually thinking about checking the coolant in me radiator cause its been happening for a few years now
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I've lost a few decibels in the upper range so I have never heard it >:()
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Exactly the same thing happens with mine, I like to think of it as a sigh of satisfaction after a ride.