Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
Have you cleaned the carburetor bowl after you cleaned the fuel tank?
I suspect the carburetor is not getting a full stream of fuel from the tank! The carburetor is mounted on the fuel tank and the mounting gasket and base have to be flat, and the tube into the tank can be plugged or leaking!
See link above!