AN ACR SAAB 340B CREW LEFT THE GATE WITH 2600 LBS OF FUEL. THE FLT REQUIRED 3600 LBS AND THE MINIMUM FOR DISPATCH WAS 3300 LBS. ERROR ADMITTED. THE FLC DID NOT CHK THE FUEL CAREFULLY UNTIL THEY WERE TAXIING TFC.

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I WAS ACTING AS FO ON AN AIRLINES FLT FROM BOSTON TO OTTAWA. AS I WAS PERFORMING MY PREFLT INSPECTION; THE ACFT WAS BEING FUELED. I BOARDED THE ACFT AND BEGAN MY PAPERWORK FOR THE FLT. I CHKED THE DISPATCH RELEASE AND NOTICED WE WERE PLANNED FOR 3600 LBS OF FUEL WITH 3300 LBS BEING OUR MINIMUM FUEL. I LOOKED AT THE FUEL GAUGES AND WROTE DOWN THAT THERE WAS 3600 LBS OF FUEL ON BOARD. IN FACT; THERE WAS ONLY 2600 LBS OF FUEL. THE CAPT ARRIVED TO BEGIN THE BEFORE STARTING ENG CHKLIST WHICH HAS AN ITEM THAT ASKS TO CHK FUEL QUANTITY; BAL; LIGHT; AND DOOR. THE CHKLIST IS NOT REQUIRED TO BE CHALLENGE AND RESPONSE; IF THE FO IS BUSY WITH OTHER DUTIES RELATED TO THE FLT. THE CAPT ASKED ME IF THE FUEL DOOR WAS CLOSED AND THE PROP WAS CLR. WE RECEIVED OUR CLRNC TO START THE ENGS. AS WE TAXIED FROM THE GATE; WE PROCEEDED WITH THE TAXI CHKLIST (WHICH MUST BE CHALLENGE/RESPONSE). AT THE FUEL QUANTITY ITEM; WE NOTICED THAT THERE WAS ONLY 2600 LBS OF FUEL ON BOARD. WE IMMEDIATELY TURNED AROUND TO GET MORE FUEL. WE FUELED UP TO 3600 LBS AND THEN DEPARTED. FACTORS THAT LED TO THIS WERE: MISCOM BTWN COMPANY OPS AND THE FUELERS. ALSO; BTWN THE FUELERS AND FLC. AND ALSO; FOR THE CREW TO BE MORE OBSERVANT TO THE FUEL GAUGES AND TO CHK THEM MORE CAREFULLY BEFORE DEP. I RECOMMEND THAT ALL THE PERSONS MENTIONED ABOVE SHOULD WORK HARD TO COMMUNICATE THEIR INTENTIONS AND FOR THE FLC TO USE BETTER CRM TO AVOID THIS FROM OCCURRING AGAIN; AND TO HAVE THE CREW CHK THE QUANTITY TOGETHER DURING THE BEFORE STARTING ENG CHKLIST.