1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 313Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 313

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FUEL INJECTION DISASSEMBLY AND REASSSEMBLY
CLEANING AND INSPECTION
1 Clean the exterior of the ECM with dry cloth being careful to avoid contact with connector pins2 Inspect outer surfaces