1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 350Get this manual

1999 Mercruiser HI-Performance GM 377 EFI Engine Service Manual, Page 350

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DIAGNOSTICS
Engine cool down period (ten minutes) is necessary to avoid irregular readings due to "heat soak" fuel boilingRelieve fuel pressure in the fuel rail as outlined in "Fuel Pressure Rel