AN ACR MD80 FLC HAS TO MAKE 4 APCHS AND DECLARED A FUEL EMER BEFORE LNDG IN POOR WX.

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AT APPROX XD45 WE WERE CLRED FOR ILS APCH RWY 22L. FO FLYING. JUST OUTSIDE THE OM EWR TWR INSTRUCTED US TO GAR; AND SAID WE WERE TOO CLOSE TO HVY ACFT IN FRONT OF US. WE REENTERED DAISY CHAIN OF ACFT. (NOTE: TCASII WAS SHOWING US RIGHT ON 5 MI LIMIT.) APCH CTL TOLD US TO MAINTAIN 170 KTS TO OM WHICH WE DID. DURING NEXT APCH FOR RWY 22L WE WERE CLRED AT APPROX 8 MI OUT. FO FLYING ON AUTOPLT. AFTER LOC CAPTURE ACFT WAS TRACKING SOMEWHAT ERRATICALLY (ON RWY 22L THIS IS SOMETIMES NORMAL). FO DISCONNECTED AUTOPLT AND FLEW APCH MANUALLY (WE WERE UNDER THE ASSUMPTION THAT THE WX IS STILL 600 FT OVCST AND 10 MI VISIBILITY). APPROX 600 FT I NOTICED THE LOC DRIFT TO THE L; NOT 1 DOT DEV; BUT INCREASING. I REQUESTED FO TO MAKE A GAR AND WE DID. (WE MAY HAVE DSNDED TO 450 FT OR SO ON APCH.) ON GAR WE TALKED ABOUT THE APCH AND FO SAID EVERYTHING WAS CTRED ON HIS INSTS. I REQUESTED CLOSE IN VECTORING FROM APCH CTL AND WX FROM THE TWR WAS NOW 200 FT OVCST AND 1/2 MI. WE BRIEFED A MONITORED APCH; FO FLYING. WE WERE CLRED FOR ILS RWY 22L APCH. AT 600 FT THE AUTOPLT DISCONNECTED (BY ITSELF). I REQUESTED FO TO GAR WE DID. ON THIS APCH I NOTICED THAT THE FO'S LOC SEEMED TO BE ERRATIC. WE TALKED ABOUT IT AND FELT HIS WAS NOT RELIABLE. WX NOW RVR BETTER THAN 6000 FT. I TOLD APCH CTL THAT WE ARE AT MINIMUM FUEL AND NEEDED A CLOSE-IN VECTOR FOR THE APCH. THEY OBLIGED; I FLEW THIS APCH ON AUTOPLT AND LANDED. CONTRIBUTING FACTORS TO MINIMUM FUEL LNDG. CHANGING WX CONDITIONS NOT PASSED ON TO PLTS. FO LOC ERRATIC. EQUIP MALFUNCTION.