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Gas Leak? 2 Years, 2 Months ago
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Wife and I went out for a ride today. Stopped and ate lunch, temps about 72. Came back outside put the key in, and turned the ignition on. I had posted a thread a while back about everytime I would turn the key I would hear a clicking/ticking noise. Some of ya'll said that it was the float bowl?
Anywho, today when I turned the ignition on, on the right side of the engine behind the air intake box (which is still stock), gas started leakin out at a pretty good pace. The bike wouldn't crank, it acted like it was flooded. I turned the ignition back off and it immediately stopped. Turned the key on again, and the same thing happened again. After about 2 minutes of constant leaking it finally stopped. It fired right up like a champ. Rode about 30 miles straight home and it still had a tad bit leaking out. For some reason my bike seems to flood and act up like this only during warm/hot weather. I called my brother in law who is a mechanic, and he said that it sounded like to him that there could be a piece of trash or something. Is he correct, is there anything else I should look for to correct the problem. I have just had it pour gas out like that.
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Re:Gas Leak? 2 Years, 2 Months ago
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easyrider the ticking you hear is your fuel pump running which is normal. The flooding could be your float sticking or set to high.
If your float is sticking it will allow the fuel pump to push more gas into the bowl hence the gas coming out the overflow in the bowl.
 Try turning your gas off when you stop and don't turn it back on till you start it back up. Sometimes that helps.
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Last Edit: 2010/03/19 21:31 By Greysnake.
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06 Midnight Silverado
*nothing shines like a star*
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Re:Gas Leak? 2 Years, 2 Months ago
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Do a search here for puking.
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MS1700 (User)
Platinum Boarder
Posts: 2585
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Re:Gas Leak? 2 Years, 2 Months ago
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If it was a float problem would not it overflow hot or cold? I had same problem, Puking, My dealer wanted to fix it under warranty, so for like 27K miles or so, he tried everything, new floats, different settings, jettings, PMS adjustments, Insulating the carb from heat, Insulating the fuel lines, Checking fuel pump pressure, All under warranty. Trust me when I say only cure is to go Pumpless, I resisted only because dealer was paying the bill, but he never gave me the money for the spilled gas, nor any reimbursement for embarrassment.
Credit Makcap for talking me into it just before my 3000 + Mile trip. (In the heat of July and gulf of Mexico) Went pumpless and haven't spilled any gas that way since. There is an article on it in the tech section, go all the way, Suzuki Float Valve, Vent the gas cap, and Pingle fuel flow valve and cleanable Hi Flow Gas filter.
And never have that problem again.
Bonus, you will have removed a weak link, an electric fuel pump that will die on you someday when you want the bike to start, it won't.
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Re:Gas Leak? 2 Years, 2 Months ago
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First rule about carb club; close your fuel cock.
Second rule about carb club; close your fuel cock.
Third rule about carb club; close your fuel cock.
You may be having what is called "boil over". The carb gets very hot, when you shut the bike off the engine components get even hotter from lack of air flow and the fuel bowl no longer has fresh cool gas flowing through it so the fuel will evaporate out and then the bowl gets even hotter. Turn the ignition on and the fuel pump fills the very hot bowl with fuel that instantly boils, expands, then dumps. Closing the fuel cock for a half a minute before shutting down tends to stop this. Why? I really don't know. I do know that it does help keep the fuel that is in the bowl at the monment from boiling over becuae you are giving the fuel a little more space to expand. I also do know that any gravity fed side draft fuel system, even with an extra fuel pump, needs to have the fuel cock closed when the engine is off. If your needle does not seat in the carb body then your whole tank of gas can be emptied into your cylinders and then your crank case and that IS NOT GOOD! Remember, our floats are set very low and the less fuel, the quicker it gets hot enough to boil. jmho
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2007 Roadstar all factory
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Re:Gas Leak? 2 Years, 2 Months ago
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Thanks for the help guys. I am about to start another 48 hour shift and will not be able to get to it until monday. Glad there are other people out there smart enough to figure out all this stuff. I checked it again when I got home last night and never had that problem of a new term I have learned, "Puking".
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Re:Gas Leak? 2 Years, 2 Months ago
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What the prior two posters are trying to say is correct and true. What we suspect in the simplest terms and a fire service phenomenon. Bleve Boiling liquid evaporating vapor explosion now it is a vented system so hopefully no explosion but a few cases of fire. Although fire seem isolated to very few and could be further problems.
So in a nut shell with the stock set up you have a great ride shut down and the heat sink on a stock set up occurs. If the heat sink is not a familiar to you just call it a hot box. If you have ever adjusted your idle or pms you know how hot it is in there. So you get a Blev minus the last e . All in all the fuel pump, pumps and doesn't know or measure the pressure in the line. Now you say vapor how is that puking, so we add air when starting and we have cooling. So this sets up vaporized fuel reverting as well as additional pressure in the line adding in a pump and to much fuel. If you open air flow ie no pump or relocate and add a Bak or high flo air source you then allow heat dissipation and reverse the heat sink. I will say you will not be able to shield this. Believe me MS1700 tried everything except putting a micro fan on the carb bowl. Yet another thing to go wrong. So if you don't let the heat dissipate the problem will persist.
So you need to open the left by relocating or ditching the pump. Open the right by one of several aftermarket or Mr. C air cleaner mod. If you go pumpless see the tech section and do what it says.
Sure the petcock works most of the time but not all. The cure is at hand the choice is yours.
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MS1700 (User)
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Posts: 2585
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Re:Gas Leak? 2 Years, 2 Months ago
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About the rules on fuel cock,
for about 21K miles I tried that, although it did help a small amount, when it pukes it pukes fuel in or not, say I shut it off 3 blocks from the house and run it dry and glide into the shop. Wait 3 days, turn fuel on, soon as I turn key on, FLOOD! Fuel pump BLASTED fuel past the float and it dumped fuel all over and could only be stopped by turning off ing. or fuel flow. I have witnesses.
Fuel Cock shut off no 2, Shut fuel off but leave enough in to start the bike. Start bike without turning fuel flow on, Bike idles, soon as I would turn fuel on FLOOD! Can only be stopped by turning bike or fuel cock off.
If you have the puke problem where it pumps fuel out as he 1st describes, there is no cure but to go pumpless, I went to Yamaha dealers all over country in my travels, they said every year the subject it brought up in their dealers convention and no one has come up with a cure. Yamaha cured the problem in 2008 it's called EFI.
Turn off the fuel all you want, if you have puking problem, it's still going to dump fuel intermitently and flood the engine just as Org. post discribes. You have it or you don't.
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icatchemall (User)
Everyone Die's...but not Everyone Live's
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Posts: 480
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Re:Gas Leak? 2 Years, 2 Months ago
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MS1700 wrote:
About the rules on fuel cock,
for about 21K miles I tried that, although it did help a small amount, when it pukes it pukes fuel in or not, say I shut it off 3 blocks from the house and run it dry and glide into the shop. Wait 3 days, turn fuel on, soon as I turn key on, FLOOD! Fuel pump BLASTED fuel past the float and it dumped fuel all over and could only be stopped by turning off ing. or fuel flow. I have witnesses.
Fuel Cock shut off no 2, Shut fuel off but leave enough in to start the bike. Start bike without turning fuel flow on, Bike idles, soon as I would turn fuel on FLOOD! Can only be stopped by turning bike or fuel cock off.
If you have the puke problem where it pumps fuel out as he 1st describes, there is no cure but to go pumpless, I went to Yamaha dealers all over country in my travels, they said every year the subject it brought up in their dealers convention and no one has come up with a cure. Yamaha cured the problem in 2008 it's called EFI.
Turn off the fuel all you want, if you have puking problem, it's still going to dump fuel intermitently and flood the engine just as Org. post discribes. You have it or you don't.
I had the same problem last year. 95 out and on the way back form a ride we stop to fill up. Everything was fine, stop to have a quick drink and turn on the key on dump fuel like crazy. shut the key off it stop. I was thinking the gas was cold and the bike was to hot. We went back in side for 15 min. and came out did the same thing. Waited some more and it work out.
Thanks for all the info  I just moved the pump to the right side and insulated the line going to the carb. Will see what happens when it gets hot, If so we are going pumpless. Thanks again guy's
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MS1700 (User)
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Re:Gas Leak? 2 Years, 2 Months ago
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icatchemail, It will happen less. But I predict it will still happen. People who relocated the pump have reported relief here. I know it has something to do with heat at the bowl, as when i insulated my bowl I got a lot less puke, but still it puked. Some say it was type gas, I don't care what kind of gas is put in, as long as it is legal gasoline, it should not puke. Yamaha should have recalled it.
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