What was found
DURING APPROACH PASSING 1200 FEET A STRONG SMELL OF JET FUEL BECAME APPARENT. LASTED STRONG ENOUGH THRU TOUCHDOWN AND DISSIPATED BY TAXI SPEED. FLIGHT CREW FILLED OUT AIRCRAFT FUME QUESTIONNAIRE. ONCE ON GROUND MAINTENANCE FOUND FUEL LEAK IN THE LEFT ECS BAY AT FUEL SUMP DRAIN VALVE. THE LEFT CENTER SUMP DRAIN FLANGE WAS REPLACED. LEAK CHECK WAS ACCOMPLISHED PER B757 AMM 28-11-02-0401-926A-A. ALL CHECKS GOOD.