2010 john deere carb

I have a 1963 john deere with the marvel 464 carb I have had 3 different carbs on it and the gas still leaks out when the tractor is not running I rebuilt first one then bought a rebuilt and the gas ran through it so I took it back and got another one and the gas still leaked so I need help I need to know how to fix any help would be great
 
Common problem on most any tractor due to being an up draft carb. That is why one should always shut the gas off when you park a tractor
 
Your fuel tank might be full of rust and need cleaned out.

Some readers won't like my next suggestion. Add an inline fuel filter. Get a good brand from Carquest or NAPA.

An inline filter will catch more rust than the brass screen in the strainer. Rust is so fine it will pass through the screen.

I like to go to local auctions and watch the of tractors sell. Over half the tractors will have inline filters added.
 
MHO, leaking carbs are the result of the needle not seating properly or the float level to low. I avoid the new tip (viton) ones as they get a ring in the end. Try polishing the inside of the seat, a little brass polish on a Q-tip stuck in a drill will clean up the inside to a mirror finish. Inspect the needle for corrosion and polish that as well. Then with the gasket on the top, turn it over with the float attached and use the end of a dill of the correct size as a gauge to set the float by rolling it under the top of the float and gasket. BTW according to the books the original carb was a TSX 808, I did not find a listing for the 464, but many carbs were changed over the years, the last 2010 I worked on had a TSX 711 from a cotton picker.
 
It probably is rust/trash coming down the fuel line. Be sure the strainer screen is in the separator bowl, you can add an inline filter, but it may cause a restriction. Cleaning out the tank will help, but may cause it to start leaking, be gentle.

A good test is to place the fuel line in a clean glass container, fully open the fuel valve and see what comes out. If it's dirty, that is what will be going into the carb, and will block the needle from sealing against the seat.

Once the system is clean, get some clean fuel flowing from the line before connecting it to the carb, and be careful not to get anything in the end of the line or the carb fitting while connecting the line.

One other tip, if it does start flooding, turn off the fuel and drain the carb. That will allow the float to drop and anything trapped in the needle/seat can flush out. Also, it is normal for an updraft to drip fuel following a failed choke assisted start. Don't confuse that with true flooding.

Any gravity flow fuel system should be turned off at the tank when not running.
 
"Try polishing the inside of the seat, a little brass polish on a Q-tip stuck in a drill will clean up the
inside to a mirror finish."

That's a great idea! Never thought of that, will have to give it a try.

Thanks!
 
You're right Steve , I've seen a few older updraft carbs that have a little granulated brass plug in the bottom of the inlet neck just for that reason.
 
(quoted from post at 11:12:50 12/29/15) You're right Steve , I've seen a few older updraft carbs that have a little granulated brass plug in the bottom of the inlet neck just for that reason.

All of the updraft carbs have that plug in the bottom. It is there to allow the condensation (water) to escape. If gasoline is dripping from that plug, there is MAJOR problems.
 

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