FLC OF AN EMB120 DEPARTED WITH INSUFFICIENT FUEL FOR THE TRIP AND HAD TO RETURN LAND FOR MORE FUEL.

Narrative

WE DEPARTED GJT ARPT BEFORE FUELING ACFT FOR 1 HR FLT. WE HAD SOME MAINT WRITE-UPS SO THE CAPT WENT INTO TERMINAL TO CALL FOR CTL NUMBERS. I STAYED WITH THE ACFT AND PERFORMED POSTFLT INSPECTION AND HELPED FLT ATTENDANT WITH BAGS; AS THE PAX WERE BOARDING. I WAS FIRST IN TO THE FLT DECK. THE CAPT WAS 10 SECONDS BEHIND ME. I WAS WORKING ON THE MANIFEST AND THE CAPT ASKED IF I HAD DONE THE BEFORE START CHKLIST. I TOLD HIM 'NO.' HE THEN PERFORMED THE CHKLIST AS I COMPLETED THE MANIFEST. IT IS AT THIS TIME THAT THE FUEL QUANTITY IS CHKED ON THE BEFORE START CHKLIST. HE THEN STARTED THE #2 ENG. I WAS THEN DONE WITH THE MANIFEST AND JOINED HIM IN THE CHKLIST AT #1 ENG. I THEN RAN THE AFTER START CHKLIST; AND CALLED FOR TAXI CLRNC; IFR CLRNC BEFORE TKOF CHKLIST; AND THE TKOF FINALS. APPROX 5 MINS INTO THE CLB THE CAPT NOTICED NOT ENOUGH FUEL FOR TRIP (APPROX 1000 LBS). WE RETURNED TO THE ARPT FOR FUEL. ALTHOUGH HE MISSED THE FUEL QUANTITY ON THE CHKLIST WE BOTH HAVE RESPONSIBILITY; AS A CREW; TO COMPLETE A FLT SUCCESSFULLY. THE CHKLISTS SHOULD BE READ COMMAND AND RESPONSE. THIS WOULD ELIMINATE THIS ERROR IN THE FUTURE.