What was found
AFTER LT & RT ENGINE START, & PACKS TURNED ON, AFTER ONE MINUTE WAITING. STRONG ODORS OF FUEL WERE SMELLED, CABIN & FLIGHT DECK FOR PROLONGED TIME. APPROX 5 MINS. IT EVENTUALLY DISSIPATED IN THE CABIN BUT REMAINED IN THE FLIGHT DECK. RETURNED TO GATE. RAN BOTH PACKS WITH APU BLEED, NO ODOR NOTED. RAN BOTH ENGS, ONE AT A TIME WITH ENGINE BLEED AS SOURCE WITH BOTH PACKS OPS. FOUND LT ENGINE BLEED HAD AN OILY ODOR. RT ENG BLEED, NO ODOR. STARTED NR 1 ENG AFTER INITIAL RUN, OIL ODOR INCREASED. PERFORMED FIM TASK 71-05 FAULT TREE 828. ENG. OIL/FUEL ODOR IDENTIFIED IN CABIN STEPS 1 THROUGH AND INCLUDING STEP 4. NO DEFECTS NOTED. PERFORMED FIM TASK 71-05 FAULT TREE 828. ENG. OIL/FUEL ODOR IDENTIFIED IN CABIN STEP 5. PERFORMED BOROSCOPE. NO EVIDENCE OF OIL STAINING FOUND. CONTINUED WITH FIM 71-05 TASK 828 FROM STEP 5 TO COMPLETION AT STEP 42. NO FAULTS OR DEFECTS FOUND.