C8.3 Commercial Marine and Ind [...] Engine Identification Section E - Engine Identification Page E-9 The Cummins part number for the fuel pump-governor combination is located on the governor dataplate. ECM Dataplate The external ECM dataplate is located on top of the ECM. The dataplate contains the ECM part number (P/N), the ECM serial number (S/N), the manufacturing date code (D/C), the engine serial number (ESN), and the ECM code.