Succion when opening gaz tank...

[RocketGuy75]

Is it normal when I open my gaz tank, it alaways made a air succion? My previous bike, some time on a long ride, between two reffil I have heard that succion niose, but not if I open the cap after let say a day park. Is it my cap who is faulty and not let the air flow or is it normal?

Sorry for my english!

 

[Journeyman]

My guess is that the vent hose is pinched. It runs down the right side of the tank near the front. Look in the Resources heading at the top of the page for the service manual. If you've had a 10, 20, 30, etc. mile service then the tank was lifted and the hose may have been pinched on re-installation.

 

[Protonhound]

Some have also reported that laying your gas cap upside down while fueling might cause it's internal venting mechanism to malfunction. I always put mine right side up on a paper towel.

 

[Einar]

Is it normal when I open my gaz tank, it alaways made a air succion? My previous bike, some time on a long ride, between two reffil I have heard that succion niose, but not if I open the cap after let say a day park. Is it my cap who is faulty and not let the air flow or is it normal?

Sorry for my english!

The noise could be the tank either sucking in air or expelling air. Most people with the issue seem to experience the latter.

If it's expelling air, it's due to a high-pressure condition in the tank, so likely a pinched/restricted vent hose or possibly an issue with a valve (roll over valve or check valve). Possibly one of them installed upside down?

If it's sucking air in, it's due to a low-pressure condition in the tank, which would probably mean the fuel cap's one-way valve isn't allowing fresh air in.

 

[TURBO200R4]

Is it normal when I open my gaz tank, it alaways made a air succion? My previous bike, some time on a long ride, between two reffil I have heard that succion niose, but not if I open the cap after let say a day park. Is it my cap who is faulty and not let the air flow or is it normal?

Sorry for my english!

Wow that sucks
Lol

 

[Protonhound]

Wow that sucks
Lol

Or it might blow, depending.