A B757-200 EXPERIENCES AN ENG FIRE AFTER RETURNING TO THE GATE AND SHUTTING ENGS DOWN. #1 ENG HAD LOST 8 QUARTS OF OIL DURING WX INDUCED TFC DELAY.

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XA23; FREQ 121.90; BOS GND; GATE XX. DURING A LONG WX DELAY ON THE GND IN BOS; WE OBSERVED THE L ENG CONSUMING OIL -- OVER 8 QUARTS IN ALMOST 2 HRS. WE CALLED BOS MAINT TO CONFIRM ANY ENG OIL CONSUMPTION PROB -- NO HISTORY OF THAT MUCH CONSUMPTION WAS NOTED. THE LOGBOOK NOTED 11 PINTS ADDED IN ALMOST 3 DAYS. MAINT AND I AGREED TO RETURN TO THE GATE TO HAVE THEM CHK OUR THE L ENG. ONCE AT THE GATE; I SHUT DOWN THE ENGS AND READ THE CHKLIST. WE NOTICED THE LARGE AMOUNTS OF WHITE SMOKE FOGGING OUT THE TERMINAL FROM THE OUTSIDE. I SENT THE FO TO LOOK AT THE L ENG TO SEE IF IT WAS FROM US. INDEED THE ENG WAS SMOKING HVY AND THE OIL ON FIRE. I ORDERED THE AGENT AND THE FLT ATTENDANTS TO REMOVE THE PAX; ORDERLY; THROUGH THE L1 MAIN CABIN DOOR. THE MAINT SUPVR AT THE GATE WITNESSED THE FIRE AND CALLED CFR TO THE GATE. CFR ARRIVED WITHIN 1 MIN. ALL PAX WERE REMOVED FROM THE ACFT WITH NO INJURIES INTO THE TERMINAL. MAINT TOLD US THE ACFT WAS OTS. AFTER A NEW ACFT WAS FOUND AND TO BE ARRIVING AFTER XA30 HRS LCL TIME (AFTER THE ACFT WAS DEPLANED) I MADE THE LOG ENTRIES AND THANKED THE MAINT TEAM AND CFR TEAM THAT MET THE ACFT. AFTER THE LONG DELAY AND THE ENG FIRE EVENT AND THE NEW DUTY DAY AND TSTMS THAT STILL LAY AHEAD; I FELT THAT I COULD NOT SAFELY CONTINUE TO ACT AS PIC AND I CALLED IN SICK TO TRACKING.