fjrchooser
Well-known member
Guess I'll have to check the orange grommet again when I'm near the bike again.
However, in both my geysers, nothing happened until I added cool gas from the pump to the boiling gas in the tank. The tank cap was wide open for several seconds to over 2 minutes before my geysers allowing plenty of time for any pressure to equalize. Other than the boiling fuel - picture a pot of water at full boil, thats what I saw looking into the tank both times- I don't see where a pressurized tank comes into to this phenom. Nothing but a chuff on opening, an nothing more would have happened had I not added fuel while it was still boiling.
Silver Penguin, I've got no idea if the formulations that change octane also change vapor pressures/boiling points enough for 85 to do this at altitude when 87 hasn't. Could be coincidence that I've only run into it with the 85. Of course ,other than Nebraska I've also been at altitude simultaneous with the 85 usage & geysers. No geysers in Nebraska and I'm sure it was hotter there too but don't recall the gas boiling like it did in the mountains.
Perhaps a combination of the tank overpressurizing (orange grommet?) and lowered atmospheric pressure reacting with the 85 formulation ? Like carbonation being released ? Maybe 87 would have done this too at the time, I dunno.
My avoidance in the meantime will be to re-check the venting and not re-fueling until the tank stops boiling.
However, in both my geysers, nothing happened until I added cool gas from the pump to the boiling gas in the tank. The tank cap was wide open for several seconds to over 2 minutes before my geysers allowing plenty of time for any pressure to equalize. Other than the boiling fuel - picture a pot of water at full boil, thats what I saw looking into the tank both times- I don't see where a pressurized tank comes into to this phenom. Nothing but a chuff on opening, an nothing more would have happened had I not added fuel while it was still boiling.
Silver Penguin, I've got no idea if the formulations that change octane also change vapor pressures/boiling points enough for 85 to do this at altitude when 87 hasn't. Could be coincidence that I've only run into it with the 85. Of course ,other than Nebraska I've also been at altitude simultaneous with the 85 usage & geysers. No geysers in Nebraska and I'm sure it was hotter there too but don't recall the gas boiling like it did in the mountains.
Perhaps a combination of the tank overpressurizing (orange grommet?) and lowered atmospheric pressure reacting with the 85 formulation ? Like carbonation being released ? Maybe 87 would have done this too at the time, I dunno.
My avoidance in the meantime will be to re-check the venting and not re-fueling until the tank stops boiling.