What was found
DURING THE FIRST 3.6 HRS OF FLIGHT, 7 LEGS REPORTED, THE CREW DETECTED AN OVERWHELMING ODOR OF JET FUEL IN THE COCKPIT AND CABIN DURING CLIMBS AND DESCENTS. THE PILOT IN COMMAND EXPERIENCED A STRONG HEADACHE AND ONCOMING NAUSEA. THE SECOND IN COMMAND ALSO COMPLAINED OF A HEADACHE. THE FLIGHT WAS TERMINATED AND THE ACFT WAS TURNED OVER TO MAINTENANCE. THE ENGINES AND DRAINS WERE INSPECTED. NO FUEL LEAKS WERE DETECTED. FOUND 2 EA DRAINS PLUGGED AND 1 FUEL TANK VENT CRIMPED. CLEARED DRAINS AND PERFORMED ENGINE GROUND RUNS. NO OBVIOUS ODORS WERE DETECTED. ALL MAINTENANCE PERFORMED IAW S61-MM, CHAPTER 20-00.