Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 185Get this manual

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FUEL PUMP
Problem: Lack of Fuel Pump Pressure
An anti-siphon valveAir in fuel lineA dirty or clogged fuel filterThe fuel pickup in fuel tank is clogged or dirtyWorn out fuel pump diaphragm

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