Engine Trouble

Hello - I have a 1963 AC model D15 gasoline engine. Today, the engine starting out, sputtering and usually, dying. I can always start it right back up though. I cleaned the fuel cup and screen. There was a lot of sediment on the bottom, and I was hoping that would do the trick. It didn't. It seems like it is likely to cut out when the engine strains, like when you let off the clutch kind of quickly, or when it strains going up a slope. That is about all I know. I am a rookie when it comes to engines and tractors, so it will be easy to talk over my head. I have owned it for the past 6 months and this is the first issue of any kind. It has always purred like a kitten so far and has been a great cold weather starter. Help! Thank you!

Take bowl and screen off . Open and drain into small bucket . Let run for a while and see if it slows down . If it does turn valve body out of tank and clean screen that is up in tank . If plenty comes out for a while work the other way and find the restriction.

Thanks for everyone's replies so far. I will put everything under consideration. Please keep the good ideas coming!

Since you had sediment in class bowl from experience I would unscrew glass bowl from gas tank and clean.  I hope the tank is not full of gas.

Another way you can tell if you have sufficient gas flow is to shut off gas and clean glass bowl.  Put bowl back on an turn on gas.  If the gas fills by drips and takes time to fill with no leaks between gasket and bowl probably is stopped up in neck of bowl unit. This will require unscrewing unit from tank to clean sediment out of neck.

Thake the plug out of thenottom of the carb catch it in a clean container O used a small square cottahe cheese container if you e had a y dirt or water in ot whatever made it throught the sediment bowl will be im the bottom of the carb ig its perfectly clean thats not your problem if i leave a tractor setting out for any length of time and dont checkthe sediment bowl it draws the water into the carb itll start but run out of power and die. Drain the carb and im good. Always check the simplest thing first

I'm not sure who all will be following up with this, but the problem seems to be solved. It was a fuel clog. I first tested the flow from the carb and it seemed pretty good. Then I tested the flow from the glass debris bowl (not sure of proper term) right at the valve. It seemed slow, even though I have never seen a good or bad gas flow before. So I first had to empty the just topped-off tank of gas, and then I dropped the glass bowl unit. Even to an untrained eye, it looked clogged.  There were a couple of pieces of hard rubber, or something, and a glob of silicone right in the flow hole. (I took pictures and wanted to upload, but I can't figure out how to do that.) I cleaned that up, and then inspected the inside of the tank. That is when I found another 3" long piece of silicone. I removed that. I reassembled and tested the flow, it was like night and day. Thank you, thank you, thank you!

I will keep that in mind - thank you!