What was found
AFTER TAKEOFF AT HIGH POWER SETTING AND RELATIVELY LOW AIRSPEED ON CLIMBOUT, A STRONG ODOR OF FUMES CAME INTO COCKPIT AND CABIN FOR ABOUT 10 MINS. THE APU WAS NOT RUNNING AND ALL ENGINE PARAMETERS WERE NORMAL. ODOR SEEMED TO DISSIPATE DURING CRUISE BUT RETURNED AND WAS LESS INTENSE ON APPROACH AND LANDING. SMELLED MORE LIKE FUEL/EXHAUST AND NOT AN OILY ODOR. CHANGED FUEL NOZZLES ON RT ENGINE. DONE IAW MFG MM 73-10-04. LEAK AND POWER ASSURANCE CHECKED NORMAL. OPS CHECKED NORMAL.