Incident Overview
After landing, while taxiing back to the ramp area, the pilot observed a fire in the left engine. The pilot secured the engine and evacuated the airplane.
Investigation Findings
Examination of the engine revealed that the fuel boost pump was leaking. The pump was subsequently tested at the manufacturer's facility, where it was determined that the wrong set of four screws had been torqued. The pump manufacturer had a service bulletin that required inspection and, if necessary, retorque of four screws securing the pump valve assembly.
Service Bulletin Ambiguity
Discussions between the pump manufacturer and the airplane operator indicated that the service bulletin contained ambiguity. Maintenance personnel were confused as to which four screws the bulletin referred to.
Corrective Action
Following the incident, the pump manufacturer revised the service bulletin to clarify the correct screws.