I have a 1965 Massey Ferguson 65 with the continental gas engine in it that runs great for a little while until you start putting a load on it. Then you have to start choking to keep running and leave it on choke a little. I took carburetor off and checked for trash, cleaned jets, etc. Put back together still have same problem. Fuel bowl had a little trash in it. Trying to figure out why not getting fuel still. I do have fuel coming to carburetor but do not know if enough. Any suggestions.