Fuel leaking out the overflow tube...

Surely you can see the fuel on the outside of the
fuel tank or a rusted fuel tube under it

You should be able to find that issue in 10 minutes
IF you get under it

That is only 2 gallons added at a time

Wouldn't you think the fuel tank is the issue,if
it leaks without the motor running

Now you also know we can not guess from here

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

recheck and clean /adjust floats pet **** doesnt stop fuel in bowl if floats out of adjustment or valve sticking/debris will allow fuel to constant flow

Sounds like a blocked breather. Be careful with all that leaked petrol.

had an sv, the pipe running in the tank corroded, and let water in the tank, lots of it., also throttle bodies are injected not carbs

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.

Bruno

most likely the tank or a hose on the tank if it was a filter it would leak no matter the amount of fuel

If overflow tube is leaking its due to too much fuel in petrol tank or could be a loose fuel pipe make sure its an overflow pipe not a fuel pipe just leaking

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.