As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT, THE ENGINE WAS ROUGH AND FUEL FLOW WAS BELOW NORMAL AND FLUCTUATING AT THAT POWER SETTING. A SAFE LANDING WAS MADE. A GROUND CHECK OF THE ENGINE OPERATION WAS PERFORMED. IT WAS FOUND THAT THE ENGINE DRIVEN FUEL PUMP WAS SUCKING AIR THRU THE CASE DRAIN VENT. PUMP WAS REMOVED AND AN NEW PUMP INSTALLED. PUMP SENT IN FOR WARRANTY.