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New user here! I'm hoping to get some advice from someone that is a little more mechanically inclined that I am. Long story short, I've got gas pouring from my carb when I turn the ATV off. It runs great, but when you turn it off the gas tank drains empty. For some reason on/off/res valve won't stop this from draining. I've rebuilt the carb, new needle valve, new float, same results. One thing I did notice is there seems to be some trash in the gas tank. Any ideas are welcome. Thanks in advance.
 

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Cleaning the fuel tank may be the problem because a speck of rust or sand can stick the float valve open. I would take the petcock apart and repair as necessary or just replace the unit. I think that the problem is mostly with the carb tho. I would disassemble it again and check EVERYTHING . Also, change your oil because fuel will usually run into the crankcase if the carb is allowed to flood unchecked.
 

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I say you got three problems right now , you cleaned the carb but didn't clean or maybe even line the inside of the fuel tank if needed , if it is rusty inside the tank your problems isn't going to stop to you get another tank or line that one , so with the dirty tank you reintroduced trash in the carb and the floatt valve is staying open and the carb overflowing , also you petcock is messed up most likely for dirt and rust having gone thru it ---check your oil as when the carb overflows there is a very good chance you have gas in your oil deluting it , check you air box also for gas in it
 

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It sounds like it's something to do with your petcock if the gas won't stop flowing regardless of what positions its in (on/off/res).

But gas shouldn't flow out of your carb if your float is working correctly.

Try this first before you go hog wild re-building carbs and adjusting valves, but definitely check the petcock and clean out the gas tank.


"This same thing happened to me the other week.

I just finished loading my bike onto the trailer, and it just started pouring gas out of the over flow line.

I found a forum post where somebody said they took the drain screw at the bottom of the carb all the way out, let the carb drain, put it back in, and voila, no more over flow.

I decided to try that since it was 9pm and I was wanting to ride the next day.

I took the drain screw out, blew into the over flow line to blow out the gas from the carb, tapped the carb a few times with a wrench to make sure the float wasn't stuck, put the drain screw back in, and voila, no more over flow!

If it just started to do this on you randomly, I would try these first and see if it works.

I rode 4 hours the next day with zero issues, and its still working fine."
 

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petcock is bad, float needle or float needle seat has trash in it ?. and a rusty gas tank is not going to solve anything..get the tank repaired/cleaned, then tackle the other problem. and welcome to the forums.
 

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What atv you have @wawenzel?

Definitely you have a petcock that needs replacement or rebuilding. Reason I ask what unit you have is some petcocks are no longer available. Rust particles can cut into the lever seal.

You have an obstruction in your float valve or the float is dirty sticking in the down position, keeping the float valve open.

Rust in the tank can be fixed by taking the tank off, plugging all holes and filling it with vinegar. The rust will loosen and can be removed. I filled my tank with BBs and vinegar, wrapped in a box with plenty of bubble wrap and tumbled it in my cement mixer for 3 hours.
 

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Goober what do you do to keep the tank from rerusting? I've got a couple of 300 tanks that looked amazing after a vinegar soak. The problem is, they rerusted pretty quickly.

I've tried (after pouring out the vinegar) flushing with water and baking soda, followed by alcohol, followed by premix and still got some flash rusting. Not bad, but not perfectly clean either.
 
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