I have a 1997 Suzuki TL1000s...ok my gas tank is close to empty, i add a gallon of gas and fuel begins to leak out the overflow tube almost immediately even though tank is only half full(engine is turned off at the time)...so basically it continues to leak until im back to where i started...What could be my problem here? ...appreciate ur help
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if you always put as much gas as you can especially when its cheaper you are probably getting fuel into the fume emissions part of the entire fuel system. see if you can find a diagram of your fuel tank system to be sure its vacuum and not fuel. don't top off . its the worst thing to a fuel system
Where exactly is it coming from. Easiest way is to clean up the bottom and try and follow it up. The carbs have hoses that gas will leak from if there is a problem with them. A stuck float valve will cause your overflow tube to drip gas when the petcock is on. Also, if your gas tank is overfilled or on a hot day, sometimes gas can come out of that overflow tube as well. Figure out exactly where it's coming from first. Or take a picture, that will help. If it is the carb overflow tube give the carbs a good whack with a plastic handled screwdriver (a big one) and that may release the stuck valve and allow it to do its job, which is closing off fuel. Other than that, the only other cylindrical thing I can think of would be the brake master cylinder, which would also drip a clear-ish liquid, that resembles gas, but doesn't evaporate at all. It is essentially hydraulic fluid. I hope this helps.
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.