What was found
(CAN) FUEL FLOWING FREELY FROM PORT SIDE WING VENT. FLOWED FREELY FOR APPROX 10 MIN. ACM CANNOT DETERMINE CAUSE UNTIL SPILL CLEANED & ACFT ABLE TO BE POWERED UP. FIRE RESCUE & ASIG FUELERS ATTENDING TO SPILL RECOVERY, NO FUEL ENTERED DRAINAGE. CAPTAIN & 2 FLIGHT ATTENDANTS WERE THE ONLY PERSONNEL ON BOARD THE ACFT AT THE TIME, THEY EVACUATED THE ACFT TO THE TERMINAL. LT PRESS RELIEF VLV REPLACED IAW AMM 28-12-01 PB401. LT FLOAT VENT VALVE REPLACED IAW AMM 28-12-05. LT FLOAT PILOT VALVE REPLACED IAW 28-23-15, FUEL OVERFLOW INSPECTION & FUEL LEAK CHECK CARRIED OUT.