As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXPERIMENTAL FUEL BOOST PUMP PN PX375B-40A-5-25-F, SN 30313 01-10. NEW PUMP BENCH TESTED BEFORE INSTALLATION, WOULD NOT SELF PRIME. PUMP ALSO WOULD NOT MAKE ANY PRESSURE ONCE PRIMED AND OUTLET CLOSED OFF. PUMP WAS DIASSEMBLED AND INSPECTED. FOUND BAD DESIGN. O-RING NOT SEATED. THIS PUMP WAS REJECTED..