What was found
DEPARTED & 4 MINUTES INTO CLIMBOUT, LT WING OVERPRESSURE LIGHT CAME ON. OBSERVED FUEL STREAMING OUT OF LT WING APPROX 2 FT FROM THE TIP NEAR THE OVERPRESSURE VALVE AREA. AFTER A COUPLE OF MINUTES OVERPRESSURE LIGHT WENT OUT & FUEL STOPPED FLOWING OUT OF WING. INSPECTED WING VENT SYS WITH NO DEFECTS NOTED. FOUND FUSELAGE TANK TO WING TANK TRANSFER SYS NOT SHUT OFF. REMOVED WING FUEL LEVEL CONTROL PILOT VALVE AND INSTALLED NEW UNIT. SYS OPS CHECK SHOWS NORMAL OPERATION. ALL WORK PERFORMED IAW MM 28-10.