A B757 ON PREFLT CHK WAS FOUND TO HAVE FUEL ON BOARD THAT WAS NOT COMPATIBLE WITH THE CREW FLT PLAN.

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WE ARRIVED LATE AT OUR ACFT WITH SEVERAL DISTRACTIONS DURING OUR ORIGINATION PREFLT. ONE DISTR WAS RECENT MECHANICAL PROBS WITH AN ENG; AND THE OTHER WAS 30000 LBS MORE FUEL THAN THE PLAN CALLED FOR. WE WERE PLANNING A RELEASE OF 29000 LBS OF FUEL; WE HAD 60000 LBS. WE MADE A CALL TO DISPATCH ORIGINALLY TO GET MORE FUEL BEFORE WE REALIZED WE HAD 60000 LBS ON BOARD. OUR BAL WAS WITHIN LIMITS; BUT AFTER BEING DISTRACTED WITH OUR TOTAL FUEL LOAD I REALIZED LATER OUR MAIN TANKS WERE NOT TOTALLY FULL. THEY WERE ALMOST FULL. OUR MANUAL REQUIRES THE MAINS TO BE FULL WITH THE AMOUNT WE HAD IN THE CTR TANK. ALTHOUGH AN ALTERNATE FUEL CONFIGN IS ALLOWED WITH THIS CONFIGN AND LEGAL; THIS WAS NOT OUR PLAN. WE WERE BUSY AND I WAS CONCENTRATING ON THE TOTAL FUEL INDICATOR. I MADE A BIG DEAL WITH OUR OPS PEOPLE ABOUT THIS ACFT IN REGARDS TO THE FUEL; THE ENG MAINT ITEM; AND THE FACT THAT THE ACFT WAS ON THE GATE AND NOT CLEANED. NORMALLY WITH 60000 LBS OF FUEL THE MAIN TANKS ARE GENERALLY FULL. AGAIN CONCENTRATING ON TOTAL FUEL ON BOARD I MISSED CHKING THE ONE MAIN TANK'S QUANTITY.