A B737-300 WHILE PARKED ON A GATE DURING A #2 ENG PYLON CHK FOR A FUEL LEAK HAD AN FAA ACI INSPECTOR ADMONISH OUTBOUND CAPT FOR STARTING MAINT BEFORE THE RPT WAS WRITTEN IN LOGBOOK.

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APPROX 150 NM FROM BNA A PAX NOTIFIED THE 'B' FLT ATTENDANT THAT CLR FLUID WAS COMING FROM TOP OF WING BEHIND #2 ENG PYLON. FLT ATTENDANT NOTIFIED ME. SUSPECTING A FUEL LEAK EVEN THOUGH FUEL GAUGES DID NOT INDICATE A LOSS I NOTIFIED BNA OPS AND ASKED FOR CONTRACT MAINT TO MEET US. ARR AT GATE WAS MET BY MAINT. I INSTRUCTED THEM TO INSPECT PYLON FOR FUEL LEAK. MAINT CTL HAD REQUESTED ME TO CALL THEM. I CALLED THEM; TALKED TO OPS; TALKED AGAIN TO MAINT (THEY DID NOT WANT TO TAKE OFF INSPECTION PANEL -- I INSISTED); BRIEFED RELIEVING CREW. FAA MAINT INSPECTOR ARRIVED; I BRIEFED HIM (ALL THIS WITHIN 10 MINS OF BLOCK IN). CHKED TO MAKE SURE MECHS WERE REMOVING INSPECTION PANEL AND WAS HEADING TO COCKPIT TO COMPLETE WRITE-UP IN LOGBOOK. FAA MAINT INSPECTOR ASKED IF IT WAS IN BOOK. I SAID NO BUT THAT IS WHERE I WAS HEADED. HE COMPLAINED THAT I SHOULD NOT HAVE CALLED MAINT UNTIL WRITE-UP WAS IN LOGBOOK. THAT IS NOT OUR PROC. A LEAK WAS FOUND. ACFT WAS GNDED AND REMOVED FROM SVC. ALL LOG ENTRIES WERE COMPLETED NORMALLY.