RETURN LAND MANDATED BY ACR MDT BEING LOW ON FUEL.

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2 EARLY MORNING DEPS AND MANY LEGS; POOR WX ADDED TO MY FATIGUE. WE WERE RUNNING LATE ALL DAY DUE TO POOR WX. AT ROA WE NEEDED A QUICK TURN TO GET BACK ON TIME. AFTER SHUTDOWN CHK; CAPT WENT INSIDE OPS TO WARM UP HIS SOUP. I STAYED ONBOARD TO GET NEW ATIS AND CLRNC AND DO APPROPRIATE PAPERWORK. CAPT RETURNED AND NOTICED FUELER DISCONNECTING TRUCK. WE PROCEEDED WITH TURN AROUND CHKLIST. AFTER DEPARTING ROA AND STARTING AFTER TKOF FLOW; CAPT REALIZED WE WERE 1000 LBS SHY ON FUEL -- BELOW MINIMUM FUEL. WE ELECTED TO RETURN TO ROA AND FILL UP; AN UNSCHEDULED LNDG. NEITHER OF US REMEMBER DOING THAT PART OF CHKLIST. ALTHOUGH WE KNOW WE DID IT BECAUSE REMEMBER OTHER PARTS OF CHKLIST. I FEEL FATIGUE; BEING IN A HURRY (QUICKTURN); AND ASSUMPTION (FUELER HOOKED UP; FUELER DISCONNECTED/WE KNOW WE HAVE FUEL) ALL LED TO THIS MISTAKE. OUR COMPANY PROC DOES NOT CALL FOR FO TO VERIFY FUEL QUANTITY; BUT FROM NOW ON I'LL ASK/RESPOND CHKS AFTER FUEL CALLOUT. I WILL VERIFY THE QUANTITY WITH DISPATCH RELEASE.