Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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The fuel pump has to be working otherwise the machine would not run at all. Does it run good for a little while (10-15 minutes) and then start acting up or does it act up right away when first started?
So the engine is not running out of fuel and stopping it is just low on power once warm. I would check the valve clearances to make sure that they are set properly as if the clearances are a little tight when the engine is cold they will get tighter as the engine warms which could be holding the valves open longer than it should and would cause a power lose as well as poor acceleration.