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650 w/ new Zenith Carb leaking gas

S

Steven Lee

Member
OK, I'm sure this is posted somewhere, and someone knows everything about it (I'm a newbie). I just installed a brand new Zenith carb to replace the original M-S(1955 650). It runs great!! Starts better than ever! Never floods! WOW!!! But when I shut it off.. it leaks like its just pouring out the bottom; Out of the aft hole in the bottom of the carb housing right where the air intake tube attaches. How do I stop this?
 
Steven;

Do you shut the fuel off at the tank? There is a shut off valve underneath the tank. You should always shut off the fuel when not using the tractor as fuel can and will leak into the cylinders, down the cylinder walls and into the oil leading to more problems. It is not uncommon for the shut off valve to wear out. They are sometimes repairable by drilling out the pin that is the screw stop, removing the screw and replacing the o-ring. Check the archives for the procedures on how to do this.

It could also be that the float is stuck. You may need to take the carb apart to check. Because it is new does not mean it won't have problems. One fellow recently put and new Zenith on his Ford and had problems. In taking it apart he found gasket material inside clogging things up.Hope this gives you some ideas where to start looking.
 
Thanks. good advice. The shut off valve is new too and works well. problem is, the original design, as it is, uses a screw driver way under the center of the tank. I may consider a new electronic shut off. But I'm also hoping there is a float adjustment procedure somewhere thatI can check before I have to disassemble it. I can only hope. Thanks!!
 
Make sure your fuel is clean and getting filtered or put on another filter. Sometimes just shutting the fuel off a while will help it seat up too but don't bet on it nothing but taking it apart is going to get all crud out if dirty fuel got stuff stuck in it. Something stuck behind needle and seat or could be a faulty brand new float? Even putting in kits with new needle and seat I sometimes have that problem with the rubber tipped needles just put them in the seat and rap on them to seat it better or metal needle hone it with something fine like baking soda or very fine grit but be sure to rinse that all out then. Toothpaste might even work to hone it with? Basic kits come with new gaskets and needle & seat.
 
Have to take it apart to check the float. Can't remember the recommended setting but usually the pontoons are level with the body or down a hair. Check float for leaks by holding it with pliers in pan of hot water not boiling and will see air bubbles spewing out if has a leak.
 
Steven;

Here's a possible solution for that hard to reach shut off valve if you are willing to put something not original on your tractor.

Take a steel rod the diameter of the shut off valve screw head. Make sure it is long enough to extend from the valve to the outer edge of the right hood panel and enough to put a 90 degree bend in it to form a handle. Grind a flat tip that will fit the slot in the screw. Use a piece of flat stock and put a open loop in the center a little larger than the rod diameter with two tabs on each side to be used as the mounting tabs to mount it underside lip of the hood panel. This will hold the outer end of the rod in place. Use 1 inch piece of rubber or neoprene tubing that fits tightly over the rod and screw head; place the rod flat tip into the screw slot and slide the tubing over the screw head to hold the rod in place. Use can then use this extension to turn the fuel on and off with relative ease. Make any changes you want to secure the rod in place. Hope I made this clear enough and it is helpful to you.
 
I'm not trying to keep GlenIdaho from making a fortune but what's wrong with a 99 cent Chinese screwdriver about 6" long. I keep one in the tool box of each of may tractors and it works great for turning the fuel valve under the tank. And the tool box is located on the same side of the tractor as the fuel valve.
 
That's rich Alan. You guys have made my day. I feel sorry for him though. Thanks for the laugh. Have a great day!
 
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