WDB ON APCH TAKES EVASIVE ACTION AS ACR ON PARALLEL APCH DRIFTS OFF COURSE.

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INBOUND TO SFO FROM KOA (KONA; HI) WITH OAK AS ALTERNATE AND EXTRA FUEL; PLANNED ARR FUEL OF 21700 LBS. SFO WX WAS IFR/VFR/IFR ETC; CAUSING DELAYS. ENTERED HOLDING ABOUT 70 NM W WOODSIDE VOR AND WENT THROUGH SEVERAL EFC AND EVENTUALLY DECLARED MINIMUM FUEL AT XA40 LCL WITH A CLRNC TO OSI DIRECT SFO. ZOA SWITCHED US TO BAY APCH ABOUT 25 MI W OSI AND WE WERE GIVEN DEPART OSI WITH A NW HEADING. JUST BEFORE OSI GIVEN VECTOR TO THE S. REMINDED BAY OF FUEL STATE. FUEL WAS BECOMING VERY TIGHT AND I WAS WITHIN SECONDS OF CHANGING TO SAN JOSE WHEN WE GOT A TURN TO THE SFO RWY 28L LOC AND PLAN A VISUAL TO RWY 28L. DURING APCH WE WERE SLIGHTLY BEHIND ACR B WHO WAS ON APCH TO SFO RWY 28R. DUE TO LOW FUEL SIT I HAD REFUSED SPDS BELOW MY MINIMUM CLEAN SPDS AND ON THE FINAL WE WERE FASTER THAN ACR B AND COULD NOT REDUCE QUICKLY ENOUGH TO NOT COME UP SIDE TO SIDE WITH HIM. BAY ASKED B IF HE HAD US IN SIGHT AND B SAID YES. BAY FOLLOWED WITH A CLRNC FOR BOTH OF US TO MAINTAIN VFR SEPARATION. BTWN THE DUMBARTON AND SAN MATEO BRIDGES ACR B STRAYED WELL S OF THE RWY 28R LOC AND RWY 28R CTRLINE REQUIRING EVASIVE ACTION BOTH VERT AND HORIZ; COMPROMISING OUR APCH. ACR B ALSO MISSED FREQ CHANGE TO TWR. ACR B FAILURE TO COMPLY WITH HIS CLRNC COMPROMISED MY FLT. AT SAN MATEO BRIDGE ACR B RETURNED TO RWY 28R CTRLINE ALLOWING US TO MAKE APCH AND LNDG RWY 28L SFO WITH 10200 LBS FUEL.