Gurgling / Bubbling fuel- 2003 ST1300 abs

sTaylor

sTaylor

Site Supporter
Joined
Jan 27, 2024
Messages
42
Location
Chicago
Bike
2003 ST1300
Greetings All-
After a moderately spirited ride - but not as long as others, I returned home. After I placed the bike onto the center stand, and the fan cycled off, I heard a steady gurgling sound. Opened the gas cap and saw bubbling fuel rolling up from the right side of the tank. This lasted 3-5 minutes. Never had an issue prior that I had noticed.
I researched the threads for any answers but to no avail. Is this an evap canister issue? Or a clogged fuel vent line? Any insights would be most welcome.
 
Yeah, it does that. Quite normal - get a torch (UK, so that is perfectly safe - its a bit like flashlight, but better) and you will see the fuel bubbling like a cauldron presumably as air and fuel in the tank cools and looses volume. Go in late at night without a flashlight (that's a bit like a torch but it doesn't matter 'cos you've been brave enought o go in without), and you will sometimes hear the ghost in the tank. To reproduce the effect, breath out and then slowly breathe in and let the air make a noise at the top of your throat. Eerie.
 
sTaylor said:
Greetings All-
After a moderately spirited ride - but not as long as others, I returned home. After I placed the bike onto the center stand, and the fan cycled off, I heard a steady gurgling sound. Opened the gas cap and saw bubbling fuel rolling up from the right side of the tank. This lasted 3-5 minutes. Never had an issue prior that I had noticed.
I researched the threads for any answers but to no avail. Is this an evap canister issue? Or a clogged fuel vent line? Any insights would be most welcome.
Click to expand...
My bike does it. No issues.
 
Thank you, fellas. Very much appreciated.
Cheers
“Fire burn, and cauldron bubbles.”
 
sTaylor said:
Greetings All-
After a moderately spirited ride - but not as long as others, I returned home. After I placed the bike onto the center stand, and the fan cycled off, I heard a steady gurgling sound. Opened the gas cap and saw bubbling fuel rolling up from the right side of the tank. This lasted 3-5 minutes. Never had an issue prior that I had noticed.
I researched the threads for any answers but to no avail. Is this an evap canister issue? Or a clogged fuel vent line? Any insights would be most welcome.
Click to expand...
A sealed gas cap increases pressure in the gas tank, a good thing. pressure reduce boiling point. The gas tank gets heated by the engine.
Gasoline does not have a single fixed boiling point because it is a complex mixture of hundreds of different hydrocarbons. Instead, it boils over a temperature range, starting at about 35 °C to 50 °C (95 °F to 122 °F) and finishing around 200 °C to 220 °C (392 °F to 428 °F)
 
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