Did thorough clean up on carb with a cleaner. Tiny hole in bowl bolt (whats it called?) was clogged. Nice and clean now. No residual gunk anywhere to break free and clog anything. Put bowl back on with shallow end on float hinge side. Keeping needle fairly unscrewed but have tried various adjustments. Starts after good bulb priming but dies soon. Runs a bit longer with more bulb pressing. Why wont carburetor continue to mix gas and air and send to cylinder after initial priming is used up? Everything is clean.