AFTER ADVISING ATC OF MINIMUM FUEL CONDITIONS; B747-400 IS FORCED TO PERFORM GAR DUE TO PRECEDING SLOWER ACFT FAILING TO CLEAR THE RWY.

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WE ENCOUNTERED 2 SEPARATE MAINT ISSUES ON GND AT ZZZ DURING TAXI-OUT AND AS A RESULT WERE AT CLRED RELEASE FUEL AT TKOF. WINDS ENRTE AND ATC VECTORING/HOLD AT KRENNA INTXN IN ORD SECTOR PUT US IN MINIMUM FUEL CONDITION. WE DECLARED MINIMUM FUEL TO ORD APCH AND WERE VECTORED TO RWY 14R FOR APCH. DURING VISUAL APCH TO RWY 14R; AN RJ WAS INSERTED IN FRONT OF US. WX CONDITIONS: CLR WINDS 220 DEGS AT 20 KTS GUSTING TO 35 KTS. WE WERE ASKED TO MAINTAIN 180 KTS TO CHSTR FIX (D7.5 IORD). AIRSPD WAS VERY ERRATIC DUE TO EXCESSIVE GUSTING WINDS ALOFT. FLAPS 30 DEGS WAS MOMENTARILY USED TO ENABLE SLOWING OF ACFT; 25 DEGS FLAPS WAS FINAL SETTING AS BRIEFED DURING APCH. AFTER XING CHSTR; WE SLOWED BUT RJ WAS MUCH SLOWER. HE WAS UNABLE TO TURN OFF AT FIRST HIGH SPD AS PER ATC DIRECTION. ATC DIRECTED US TO GO AROUND AT APPROX 300 FT. WE EXECUTED GAR AND INFORMED ATC THAT WE WERE STILL MINIMUM FUEL AND WOULD DECLARE FUEL EMER IF UNABLE TO RETURN TO ORD EXPEDITIOUSLY. WE WERE SEQUENCED INTO APCH FOR RWY 22R AND LANDED WITHOUT FURTHER INCIDENT. BLOCK-IN FUEL WAS 11.2.