Been having an intermittent problem since an unfortunate parking lot tipover (grrrr!). Twice now, I've had gas flowing out the overflow tube, both times after filling up. The first time, I got it stop by opening the gas cap and "playing" with the tube. Yesterday, I lost about a gallon of gas, and kind of got it to stop by doing the same thing. Rode it home, and everything's OK.
The tube attaches to the back of the gas tank. I wonder if it's a combination of the heat (weather), and the fact the tube may have been pulled too straight. Almost like the suction gets going, and it won't stop.
I'll follow previous responses and look at the carbs and airbox to see if gas is coming out that way, but wanted to see what knowledge base I could tap. Not terribly mechanically inclined, so it can very well be something stupid (be gentle).
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Re: Gas Leak via Overflow
The usual culprit is a blocked vent tube. Verify it's open. The usual
indicator is either a pressure release when you open the gas cap, or
a vacuum "sucking" noise when opening it first thing in the morning.
On a carb equipped bike, the carb overflow lines will leak, but in a
fuel injected bike like yours, it'll be out the overflow vent. The next
time it begins leaking, open the gas cap. It should stop immediately
as pressure inside is released. Good luck.
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Hi Paige, Seems like the problem is where the float and needle meet, The needle and seat let the gas into the bottom of the carby and as the gas rises the float rises as well pushing the needle up into the seat slowing the gas flow into the bottom of the carby.... As the motor's using the gas in the bottom of the carby the float's lowering and the needle lowers as well allowing gas into the carby, If the part of the float that meets the needle is bent down slightly it's going to let more gas into the bottom of the carb because it's not pushing the needle up when it should, YOU NEED TO BEND THAT PART OF THE FLOAT UP SLIGHTLY TO STOP THE GAS COMING OUT THE OVERFLOW.... I hope you know what I mean....CHEERS..
I am going to assume that this is a model built before 2007 and has a carburetor. The only way gas could get into your oil that I can think of is through the carburetor. It seems you may have a slow leak from a bad carburetor float valve. It must be leaking from the carburetor to the piston area and then seeping by the piston rings to the crank case. The only way to correctly fix this (if that is the case) is to repair the leak by usually rebuilding the carburetor. In the interim, after you have changed your oil, make sure that you turn your gas off whenever you park the bike to prevent the gas flow and only turn it on when you are going to ride it and when you stop to park (no matter how short a time) turn it off.
The float in the bottom of the carb is either slightly out of position or there is a bit of trash at the float needle preventing the float from closing off the gas flow. Clean the carb. Generic diagram below.
so you have a hole in your tank somewhere. or leaky fuel **** gasket. firstly you need to find the leak. or is your gas just flowing right thru your carbs and out the overflow? shut off fuel to eliminate carbs. if it stops leaking then its probably gummed up carb floats. use Berrymans B12 fuel additive this will work into the carb and hopefully break down the gum. or strip and clean them by hand with a good spray carb cleaner. or remove air cleaner and spray directly into carb and let sit for a few days.
if it's a gas tank leak then you will have to get it lined, (liquid sealer) so long as the hole is not too big. if it is then drain and dry the tank, get it welded professionally or patch it with a filler or fiberglass and then get it sealed, i used my local radiator repair shop to het mine done.
not sure of the exact height, but if you hold the carb level with fuel hose attached and pushing float up with finger, turn on petcok and slowly lower the float until it is just above horizontal. at this point, gas should start to flow out of the needle & seat.
if float turns off gas too soon, then engine will starve.
if float doesn't turn off gas, then it will flow out of the carb overflow tube.