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Discussion Starter · #1 ·
long story short i was trail riding for like 2 hours and then noticed the check engine light on. i shut off the bike and then i heard a bubbleing. thought it was my coolant[fan was on] ., then i went to see how much gas i had left and the cap was very tight. then i got it opened and the gas was boiling. that was the sound.it would bubble only when i turned the key on engine off. well the cap wouldnt vent air out of the tank. so i took the small ball bearing out of the cap and left the large ball in it and it worked. now i can see lots of vapors comeing out the tank cap vent tube all the time.is this bad? what happened here?the fuel is no longer bubbling but i see vapors coming out the tube. can it stay this way now?
 

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Discussion Starter · #3 ·
i hear ethonal has been a problem and our east coast winter gas sucks. guys with boats are saying the ethanol in the gas is causeing issues. :confused:
i run 93 octane in my quad all the time nothing else. i also hear the ethanol in the gas is causing fuel tank related problems.like softning up the fuel hoses and certain kinds of plastics,etc. :3question:
dont think my issue is related but just maybe?
 

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Do a search of the archive threads about the fuel pump recall/notice. On some of the early 06 rappys there was an issue with the fuel pump that was causing problems with winter fuels and stuff. Also there where a couple of older threads that delt with this issue.
 

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This has only happened to me and my friends 700's in the warm weather like last summer and now this spring, never in the winter. I just firgured it was heat off the pipes and engine heating the gas up to a boiling point :eek: It did it on mine a month ago....haven't heard it recently. It'd be great if someone found the reason and solution to this.
 

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I am having the same problem on my 07 700se .while my bike is running and i take the gas cap off there is alot of pressure, and if I leave the cap off for like ten seconds my bike stalls. Do you have that problem also ..the stalling part?>
 

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Last Sunday, I had a bubbling sounds too. Not sure what it was, I thought it was the Radiator. I listened to it, just ahead of the Handlebars and immediatedly thought that the sound was coming from the rad. This sound was there when I had the motor off...I left it sit for 10 to 15 minutes to allow the bike to cool down and off we went...not sure what it was yet!

I will have to keep a close eye and ear to it to see if this happens again. When I wash the Raptor, I pay particular attention to the Rad and making sure that it get cleaned out properly, so I truely do not know what the bubbling sound is, was it the rad? or was it the gas? I am unclear!

But one thing I am for sure of is, it is troubling!
 

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I had mine pushing fuel out the tube last weekend but not sure if it was hot or not. I have a aftermarket tube/vent on the stock cap. I'll have to listen for boiling fuel this weekend.
 

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Doubt it but it can boil over and leak onto the exhaust which could be bad.
 

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This is very strange. I too have had this same gas boiling issue. It also kept pushing the gas out through the vent tube and all over my white plastics, I kept stopping to wipe it off cause i dont want yellow plastics. I have the 07 white SE with an aftermarket tusk billet cap. This has only happened to me once to date and what i finally did was turn the bike off take off the cap and let it vent for about 5 minutes. When i started it back up it didnt do it anymore. I dont know what causes it???
 

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I had just gassed up so I figured it was splashing or something.... strange!
:3question:
 

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Whats the flashpoint of gasoline? Gas boiling sounds scary as hell. Honestly it sounds like a pressure issue of some sort. When you guys take off your gas cap does it sound like opening a two liter of soda? Never had this happen to me yet, But I'll keep my eyes and ears open...
 

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Boiling points lower under pressure, Maybr that's part of the problem. there are other links about this issue also. Wasn't a big deal for me, just strange but it's not been very hot up here yet....
 

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Discussion Starter · #18 ·
my problem is the stock cap is not venting pressure out. so i took it apart and took the small ball bearing out and left the large bearing in it to allow pressure out. but is this ok?how does a cap go faulty?
now with the cap venting i see more than normal vapors coming out but no more boiling.
could it be the winterfuel and or ethanol in the fuel?
 

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It may have had some dirt in it making your balls sticky :lol: Gas with ethanol should be labeled at the pump but either way if you have normal venting you should be good to go.
 

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Are you sure the gas is actually boiling?? And not a circulation problem between the feed to the injector and return line? Just a guess, I had a similar problem with a different bike that was related to the accelerator pump.
 
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