Succion when opening gaz tank...

RocketGuy75

Standard Bore
Joined
May 5, 2025
Messages
2
Location
Boucherville Qc. Canada
Ride
Rocket 3R 2020
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!
 
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.
 
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.
 
Wow that sucks
Lol
 
Protonhound said:
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.
Click to expand...
I hadn't heard that before now. I always lay it on the seat (hard to forget), but upside down. That doesn't mean it hasn't caused a problem on other bikes, or that mine won't develop an issue. I'll keep it in mind
 
I had the same problem as you after changing my air filter to install a DNA... pinched air intake pipe and, in addition, assembly of the small valve which is installed in the pipe backwards (factory...). On the other hand, I don't see the problem with the direction in which we put the tank cap when refueling... when we put it back on the bike the internal system is positioned correctly thanks to the vibrations (if this is not the case, it is generally enough to unscrew the system and clean it)
 
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