Run fine and quit

If it runs better with the choke then it sound like some type of fuel restriction to me. It could be in the carb, sediment bulb (check the screen) or something in the tank.

Air vent on gas cap could be plugged, run it with cap loose to check.

If choking helps, its almost sure to be fuel starvation. A coil or condenser heating up won't recover rapidly.

A fuel restriction can be anywhere from the screen in the tank to the float bowl. And there can be multiple restrictions in the vintage tractor. Junk in the tank can float to that screen above the shut off valve or sediment bowl. The screen in the sediment bowl can be nearly plugged with varnish and dirt. As can the pipes. Most carburetors include a screen on the inside end of the inlet adapter and that screen is notorious for plugging. I've seen one plugged so solidly it wouldn't pass air at 60 psi. Then there's a sticky float needle or float and the gas gap that's not venting. The gas cap though will shut down more rapidly with a full tank than a near empty tank.

Besides running a long time a good check is when the float bowl has a drain plug. Pull the drain plug and there should be a steady stream of gasoline about the size of a pencil in diameter for as long as there's gas in the tank. Any less shows a restriction to be found. Don't smoke while doing this test.

Gerald J.

Bet the problem is between the carburator and the gas cap.......

Remove the drain from the bottom of the carb bowl and see if you have fuel flowing free for a minute or two. You may want to catch this and please don't smoke:) If the fuel slows down or stops, you have a restriction somewhere between the float seat and the gas tank. If it flows free, you have a problem in the carb itself.

Okay.....I opened up what looked like a "wing" nut on the bottom of the Carb.

Bob

Don't know if its true bit it works for me I hope this helps if you need anything else let me know glad to help

Rich,

Thanks guys I'll let you know how I make out tomorrow.

Sorry Gerald.....

Okay,  I did what you fellas suggested and I had good flow in the fuel line

Start at the tank and work your way down.  Just from experience I'd bet you find it before you get to the carb.  Gerald's probably right, the screen on the inlet.

A good test for float needle and seat with the carburetor off and partly disassembled, is to blow with mouth at the fuel inlet. (cleaning makes it more pleasant). With the top half the carburetor right side up, gently raising the float should stop air flow and lowering the float MUST allow air at lung pressure to flow. Worn and new needles have been known to stick. Worn ones from wear, new ones from a rubber tip. That also checks the screen I keep harping on. A second check can be made with the top of the carburetor upside down. Same pressure source (lung) the weight of the float should shut the needle valve solidly, but lifting the float a little bit should allow lung pressure to pass, though it may take a bit more pressure to lift the needle when its not hooked to the float arm.

Simple tests that take no special test equipment to check for flow with little pressure and for flow shutoff to prevent flooding. Floats tend to stick down more than up, but floats can also not float because of leaks. But that causes the engine to flood and it doesn't start. Usually just sitting with a float not floating the float bowl overflows. Different symptoms.

On a neighbors, JD 2020 that screen would only allow enough fuel to get to the carburetor to run for a few seconds and then only if choked to the limit. Happened on a day when I had borrowed it and him to prune a walnut limb hanging over the LP tank. When I took out the screen fitting, I couldn't blow air through the screen with the 60 psi air in my portable air tank. He couldn't find a replacement so we ran a drill through the screen while JD delivered a new screen in a few days, and then the tractor ran fine. CHECK THAT SCREEN!

Gerald J.

Usually the screen is on a straight fitting that the elbow attaches to. Take off the elbow, then unscrew that straight fitting.

Gerald J.