| Author |
Message |
    
Chadhargis
| | Posted on Monday, April 27, 2009 - 09:49 am: | 
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Back when I had my FJR1300...it would "boil" the fuel quite often. I don't know that it was actually boiling, because as mentioned above, if I opened the fuel cap, it would stop. |
Boltrider
| | Posted on Monday, April 27, 2009 - 11:05 am: |
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My Firebolt boils fuel in the summer months, and even more so as I tick off the miles and get close to the low fuel light.
(Message edited by boltrider on April 27, 2009) |
Steeleagle
| | Posted on Monday, April 27, 2009 - 02:18 pm: |
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If the boiling stops when the fuel cap is opened, it sounds like the fuel tank is operating under a slight vacuum (less than atmospheric pressure), thus lowering the boiling temperature. When the cap is opened and the tank "sees" atmospheric, the boiling temp is raised and (unless the fuel temp is over the atmospheric boiling temperature) the boiling would stop. I'm not sure if there's a check valve in the vent that might allow a less-than-atmospheric condition to exist or not. Anybody? |
Jaimec
| | Posted on Monday, April 27, 2009 - 03:06 pm: |
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Actually, a pinched vent would prevent air from entering to replace the fuel in the tank that was drawn into the engine for combustion. That would definitely create a "lower pressure than atmospheric" in the tank condition you describe... |
Unibear12r
| | Posted on Monday, April 27, 2009 - 10:46 pm: |
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Last summer a few of us here in the mid-Cal desert region had the problem where the boiling fuel would try to launch the gas cap out of your hands and cover you with boiling hot droplets of fuel when you opened the tank. Didn't happen often, and seemed to be a Cali only thing likely due to the more sealed nature of our evap system.
I don't think anyone believed us until one of the guys launched his gas cap at our dealer in front the GM and SM. The boiling would increase greatly for a short time after opening and then fade out. The escaping gas vapors will rapidly carry heat out of the tank.
The first time it happened last year it was in the high 90s here and you usually always got a "poof" of pressure when you opened the tank.
But the engine temps are somewhat lower now and there was never a "poof" the other week when our temps were almost 100. So my hopes are up now that BMC got the fix in and I don't have to worry about "launching" when 105-110 degrees gets to be a regular thing around here. I'm sure I'll have some boiling, I'm just hoping it will be much less severe.
With today's street gas I doubt you can ever get away without some boiling, especially when you consider the really low boiling points of the ever present oxygenators. Modern gas will just suck for boiling and looks to get worse in the future.
Makes me wonder about Race gas? |
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