As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK, AFTER DEPARTURE, TOWER ADVISED THAT FUEL WAS FLOWING FROM THE LEFT WING. IT WAS VISUALLY CHECKED BY CAPT TO BE A SOLID STREAM FLOWING FROM THE LEFT OUTBOARD PORTION OF THE WING. OPS CHECKED REFUEL SYSTEM IAW MM 28-21-00. NO FAULTS OBSERVED. SUSPECT FUEL EXPANSION INTO SURGE TANK.