What was found
FUEL BEGAN VENTING FROM LEFT WING EN ROUTE DCA-MSP. FLIGHT DIVERTED TO PIT AND LANDED WITHOUT INCIDENT. FORWARD AND AFT RIGHT FUEL PRESSURE LIGHTS WOULD NOT EXTINGUISH AFTER LANDING. MAINTENANCE FOUND FUEL LINE AT FORWARD RIGHT FUEL BOOST PUMP DISCONNECTED AT UNION. LINE WAS RECONNECTED AND A NEW O-RING WAS INSTALLED. LEAK AND OPERATIONAL CHECK NORMAL, AIRCRAFT RETURNED TO SERVICE.