A PA31 NAVAJO ON TAXIING AFTER LNDG EXPERIENCED A FIRE IN THE L ENG NACELLE AFT OF THE FIREWALL. FIRE WAS EXTINGUISHED WITH ACFT EXTINGUISHER.

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I DEPARTED SRQ AT APPROX XA15Z AND WAS ENRTE TO HNB. WHILE ENRTE APPROX 25 MI SW OF CHA; WAS CRUISING AT 14000 FT AND DECIDED TO LAND AT SRB TO ADD FUEL TO THE ACFT AND LET THE PAX REST BEFORE CONTINUING ON TO HNB. WHILE APPROX 25 MI FROM SRB I NOTICED THE L FUEL GAUGE READING LOWER THAN NORMAL. I MADE A NORMAL LNDG AT SRB. WHILE STOPPING TO TURN FROM THE RWY; I NOTICED THE L ENG COMPARTMENT CONTAINED FIRE BEHIND THE ENG FIREWALL. I HAD THE AIRPLANE EVACED AND PUT THE FIRE OUT WITH THE ACFT FIRE EXTINGUISHER. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR NOTICED DURING THE FLT THE L FUEL QUANTITY INDICATOR WAS READING LOWER THAN NORMAL AND HAD DECIDED TO REFUEL. LNDG WAS NORMAL BUT ON TAXIING RPTR DISCOVERED THE FIRE IN THE L ENG NACELLE. THE FIRE WAS CAUSED BY THE ENG DRIVEN FUEL PUMP LEAKING EXCESSIVELY. THE PUMP ASSEMBLY FASTENERS WERE FOUND LOOSE EVEN THOUGH SAFETY WIRE WAS INSTALLED IN THE FASTENERS. THE FAA HAS TAKEN POSSESSION OF THE PUMP FOR INVESTIGATION. THE ACFT SUSTAINED EXTENSIVE DAMAGE; HOSES BURNED. A FALSE SPAR SUPPORTING THE LNDG DAMAGED NEEDS TO BE REPLACED. NO PAX INJURIES WERE INCURRED. THE ENG WAS AN AVCO LYCOMING T10-540-J2BD.