W0QNX
Blacksheep Tribal Member
- Joined
- May 30, 2006
- Messages
- 3,329
- Location
- Pensacola, FL. USA
- Bike
- 06/ST1300 19/R1250RT
- 2024 Miles
- 007437
I doubt it's a vent line mainly because we have here 2 examples of a well vented tank (opened) bubbling away. It's boiling, plain and simple. It does that.
Mine has done this since new as did all 4 of my Honda Valkyrie's when they are hot. I think it's just the lower boiling point of good old blended fuel. ST1300 even will "heat" the gas up for you as you ride or sit in traffic. The 2 fuel tanks get plenty of heat off the engine and the fuel rails send back warm fuel to the tank. "Gas" can boil as low as 95f or 122f depending on who says so.
.
"Motor gasoline, as defined in ASTM Specification D 4814 or Federal Specification VV-G-1690C, is characterized as having a boiling range of 122 to 158 degrees Fahrenheit at the 10 percent recovery point to 365 to 374 degrees Fahrenheit at the 90 percent recovery point."
Mine has done this since new as did all 4 of my Honda Valkyrie's when they are hot. I think it's just the lower boiling point of good old blended fuel. ST1300 even will "heat" the gas up for you as you ride or sit in traffic. The 2 fuel tanks get plenty of heat off the engine and the fuel rails send back warm fuel to the tank. "Gas" can boil as low as 95f or 122f depending on who says so.
.
"Motor gasoline, as defined in ASTM Specification D 4814 or Federal Specification VV-G-1690C, is characterized as having a boiling range of 122 to 158 degrees Fahrenheit at the 10 percent recovery point to 365 to 374 degrees Fahrenheit at the 90 percent recovery point."