B767 ETOPS FLT CREW HAS LEFT AFT FUEL PUMP FAIL. PRECAUTIONARY DIVERT TO HNL.

Narrative

I WAS THE FO ON FLT FROM KAHULUI; MAUI; TO ZZZ ON APR/MON/07. PREFLT AND DEP WERE NORMAL. IN ADDITION WE WERE BEING LINE CHKED BY AN FAA INSPECTOR. APPROX 200 NM W OF FIX ENG ON THE ECHO TRACK WE WERE ALERTED VIA EICAS THAT THE L AFT FUEL PUMP LOW PRESSURE CONDITION EXISTED. THE CAPT AND I COMPLIED WITH THE APPROPRIATE CHKLIST AND NOTIFIED BOTH MAINT AND DISPATCH OF THE SITUATION. THE CAPT RECEIVED ALL PERTINENT INFO AND MADE THE DECISION TO RETURN TO HNL. BOTH MAINT AND DISPATCH AGREED WITH THE CAPT THAT THAT WOULD BE THE MOST PRUDENT DECISION. THE CAPT ALSO BRIEFED THE FAA INSPECTOR AND THE INSPECTOR ALSO AGREED WITH THE CAPT'S DECISION. WE DID NOT DECLARE AN EMER; BUT DID TELL ATC THAT WE NEEDED TO RETURN TO HNL. WE RECEIVED A CLRNC TO RETURN TO HNL AND LANDED IN HNL UNEVENTFULLY. WE ENTERED THE APPROPRIATE WRITE-UP IN THE ACFT LOGBOOK. WE THEN WERE ASSIGNED TO FLY FROM HNL TO ZZZ TO COMPLETE OUR DUTY PERIOD. WE RAISED THE QUESTION OF CREW LEGALITY AND WERE TOLD THAT WE WERE LEGAL TO FLY BY THE CREW DESK AND DUTY MGR. FAR 121.471 SECTION G STATED AND ALSO THE FAA INSPECTOR AGREED THAT IT WAS LEGAL. WE DID ASK IF THERE WERE ANOTHER CREW TO FLY; THEY SAID WE WERE LEGAL (CREW DESK) AND THAT IT WAS OUR ASSIGNMENT. WE AGREED TO FLY AND ALL PARTIES INCLUDING THE FAA INSPECTOR AGREED WE WERE LEGAL TO FLY. WE FLEW TO ZZZ; LANDED UNEVENTFULLY.