As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRE-FLIGHT RUN-UP DISCOVERED LACK OF TAKE OFF POWER AND ENGINE VIBRATION. THE AIRCRAFT FLIGHT WAS ABORTED AND THE AIRCRAFT RETURNED TO THE HANGER. THE ENGINE WAS TROUBLESHOT AND THE ENGINE DRIVEN FUEL PUMP WAS DISCOVERED TO HAVE MULTIPLE DEFECTS IN ITS LOWER DIAPHRAGM. THIS DEFECT ALLOWED FUEL TO ENTER THE INTAKE SYSTEM WITH THE MIXTURE IN CUT-OFF AND THE THROTTLE RETARDED WITH THE AIRFRAME ELECTRIC PUMP RUNNING. THE PUMP HAD 228 HOURS SINCE INSTALLATION AND NO ABNORMAL OPERATING PRACTICES WERE NOTED.