What was found
ON STARTUP IN KEF, NOTICED A STRONG FUEL OR LUBRICANT ODOR IN COCKPIT. TAXI TO RUNWAY & SINCE WE ARE A FERRY FLT ONE AT A TIME, WALKED THROUGH CABIN WHERE THERE WAS NO ODOR. ON RETURN TO GATE, ABLE TO POWER UP ON RUNWAY. ODOR RETURNED. SUSPECT FUEL CAUSING FUMES, ON ENGINE RUNS, WHEN STARTING LT ENGINE THERE IS FUEL ODOR THAT INCREASES WHEN TURNING PACK IS ON. WHEN RUNNING PACKS OFF, RT ENGINE & APU NO LONGER HAVE FUEL ODOR. PERFORMED CONDITIONAL INSPECTION IAW LOGPAGE 3084493. ON FURTHER TS, CONCLUDED FUEL ODOR ONLY HAPPENS AFTER LT ENG START WITH PACKS IN AUTO CAUSING PACKS TO RUN BEFORE FUEL VAPERS DISSIPATE FROM PREVIOUS ENG RUN. KNOWN CONDION. PHASE 5 FOR ENGINE ECRA 7300-01359.