Lycoming MSB 621B

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  Subject  - Diaphragm-Type Fuel Pump Replacement
                  This SB is notification of a requirement to replace specific diaphragm-type fuel pumps identified herein as a corrective action in response to a confirmed non-conforming fuel pump in the field. Continued operation of a non-conforming fuel pump can cause fuel leakage out of the airframer’s vent line or into the engine crankcase.
                  Each fuel pump has a 13-digit alphanumeric manufacturer’s code, which begins with two letters. The alphanumeric characters in the manufacturer’s code and its location on the fuel pump will help identify the fuel pumps affected by this Service Bulletin. The first two characters in the example manufacturer’s code RC20150620703 in are RC. The next two numbers 20 identify the manufacturing week of the year as 20 and 15 is the year. The manufacturer’s code is on the fuel pump flange or on the web.
                 

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