Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Does the carburetor have the electric solenoid in the base of it?
Does engine ever quit, or you can keep it going?
Engine has a mechanical fuel pump. Locate the pump inlet and make a test line to bypass the tank and outlet line. Drop line into the tank filler. You may have a restriction in the supply from tank.
Has to be loosing spark or fuel and fuel seems to fit!
Fuel starvation, see if you can run the fuel test.
Sorry, I see you said you did that! Seems unlikely a mechanical fuel pump would be affected by heat.
An d you said no solenoid in carb?
you can replace with bowl bolt, or disable it by removing the inner tip.