Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 232Get this manual

Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 232

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DIRECT FUEL INJECTION
The fuel pump is capable of delivering more fuel than the engine can consumeExcess fuel flows through the fuel pressure regulator, interconnecting passageshoses and back to

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