Honda ST1100 Section > Fuel & Fuel Additives ST1100

Fuel tank pressurisation

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Bikebear:
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.

Brock:
They all do it,

saaz:
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.

royst1100:
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.

bluehonda:
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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