Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 183Get this manual

Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 183

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FUEL PUMP
The fuel pump is crankcase-pressure-operated, diaphragm-type pumpCrankcase pulsating pressure (created by the up-and-down movement of piston) is transferred to fuel pump by way of pass