Gas Tank "gurgling"

[Dale]

Came home from a ride yesterday and parked the ST1300 in the garage. Heard a "gurgling" sound coming from the gas tank. Opened the filler cap and saw some air bubbles. The gas was not boiling but seemed to have trapped air rising. Could this be gas flowing into the lower tank? Never experienced this on the ST, no leaks or gas smells. I have had boiling gas working on my old Kawasaki Z1 though. Any opinions or advice would be appreciated.
Thanks, Dale

 

[dduelin]

Completely normal.

 

[wizel]

Check your fuel tank vent.

holm from Germany

 

[Tom P]

Happens when the weather is hot and the gas gets hot...what dduelin said!

 

[Al st1100]

that's what happens when you put a heat source under the gas tank.

 

[ST Gui]

Completely normal.

Exactly. There've been explanations offered. Other than the glug I've never seen a problem so I ignore it.