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!
What is the engine model? Single cylinder engine, or a twin cylinder? Has to be loosing spark or fuel if it is quitting. In the carburetor, under the air filter, is an electrci fuel solenoid, this solenoid should click open each time you flip key on and off. Do you hear this click when engine is cold? Learn the click, then when engine quits, flip key on and off, listening for the click. No click, no fuel!
I see question is still open, did you find probelm? Did you drain the fuel bowl?