Replacement high pressure fuel pump used in Mercruiser V8 engines with Gen III cool fuel module. Gen III V8 Fuel Cool Fuel Pump | EMP 1399-39541 Mercruiser Gen III fuel module replacement fuel pump kit Includes fuel pump, isolator and fuel pressure regulator Used on 5.0L MPI, 5.7L MPI,350 MAG, 377 MAG, 6.2L MPI, 496 MAG, 8.2L Mag engine models Replaces Mercury 866169A01 & 866169T01 Replaces sierra 18-8864