As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT STATED THAT THE LT FUEL PRESSURE WOULD GO TO ZERO IF THE ELECTRIC PUMPS WERE TURNED OFF. FOUND AIRFRAME MFG INSTALLED ENGINE DRIVEN PUMP INOPERATIVE.. THE PUMP DRIVE WAS FOUND TO BE SLIPPING. INSPECTED THE PUMP AND NO OTHER DEFECTS WERE NOTED. THE PUMP WAS REPLACED AND NO FURTHER PROBLEMS. (K)