As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT REPORTED LOW LEVEL WARNING FROM NR 4 COLLECTOR TANK THAT FEEDS RIGHT ENGINE. BOTH ENGINES HAD TO FEED FROM LEFT TANK. INVESTIGATION REVEALED THAT EJ ECTOR PUMP MOUNTED IN NR 1 TANK WAS OBSTRUCTED BY A STRIP OF MASKING TAPE THEREFORE NOT PERMITTING TRANSFER OF FUEL FROM FORWARD CELLS TO COLLECTOR TANK.