RPTR CLAIMS THAT FATIGUE INDUCED BY SCHEDULING PRACTICES CONTRIBUTED TO A FUEL IMBALANCE ANOMALY.

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THIS TRIP WAS ASSIGNED TO SHORT CALL RESERVES AT XA00 PST FOR AN XE00 DEP. THE ID INCLUDED A FERRY FLT FROM ZZZ TO PDX; 6 HR SIT THEN A FERRY FLT BACK TO ZZZ. THE FLT TO PDX WAS UNEVENTFUL AND THE CAPT AND I WENT TO THE FIELD HOTEL FOR SCHEDULED REST. I HAD FLOWN AN ALL-NIGHTER ON SATURDAY NIGHT; HAD ONLY A COUPLE HR NAP ON SUNDAY; COMMUTED TO ZZZ IN THE EVENING OR SHORT CALL RESERVE RESULTING 3 HRS SLEEP BEFORE BEING CALLED AT XA00 AND THEN ONLY GETTING AN ADDITIONAL HR OF SLEEP BEFORE RPTING FOR DUTY. WHEN I ARRIVED AT THE HOTEL I TOOK A 3 HR NAP THEN PREPARED FOR FLT BACK TO ZZZ. THE INBOUND FLT WAS DELAYED SO WE DEPARTED THE HOTEL AN HR LATER THAN PLANNED. ONCE THE ACFT ARRIVED; WE ENCOUNTERED AN ISSUE TRYING TO GET OMC; AND DEADHEADING CREW MEMBERS ONTO THE FERRY FLT. THIS IS ALLOWED BY THE FOM; BUT PDX CSR'S AND OPB WERE UNAWARE OF HOW TO MANIFEST THESE TRAVELERS. THE CAPT SPENT QUITE A BIT OF TIME TRYING TO RESOLVE THIS ISSUE. AS A RESULT OF THE SHORT CALL RESERVE SYS; WE WERE APCHING OUR MAX DUTY DAY (WHITLOW RULE) AND THE GDP AT ZZZ WE FELT SOME URGENCY TO DEPART. DURING THE CAPT'S COCKPIT SET-UP; HE WAS TESTING THE FUEL XFEED VALVE AND WAS INTERRUPTED. THIS RESULTED IN HIM LEAVING THE VALVE OPEN. WE COMPLETED THE BEFORE START CHKLIST BUT DIDN'T CATCH THE OPEN XFEED VALVE. NORMALLY; I LOOK AT THE PUMPS AND XFEED VALVE DURING THE CHKLIST; BUT DUE TO FATIGUE AND FEELING THE NEED TO DEPART I DIDN'T CHK THIS TIME. THE ENG START AND DEP WERE NORMAL. NEARING THE TOP OF CLB; WE GOT AN EICAS FUEL CONFIGN WITH THE ASSOCIATED LIGHT. WE IMMEDIATELY DISCOVERED THE OPEN XFEED VALVE. WE PERFORMED THE FUEL CONFIGN IRREGULAR CHKLIST; DETERMINING THAT THIS WAS NOT A FUEL LEAK AND REBALANCED THE FUEL. THE REST OF THE FLT WAS UNEVENTFUL. I FEEL THAT THE EARLY MORNING SHORT CALL RESERVE FOLLOWING THE ALL-NIGHTER; COUPLED WITH THE XA00 NOTIFICATION OF THE TRIP CULMINATED IN ACUTE FATIGUE. I WAS PLAYING CATCH UP WITH MY REST DURING THE ENTIRE DAY. IF THE XFEED VALVE HAD A GUARD ON IT; THIS MAY NOT HAVE HAPPENED.