Mercury Optimax 75, 90, 115, DFI starting year 2004 service manual., Page 163Get this manual

Mercury Optimax 75, 90, 115, DFI starting year 2004 service manual., Page 163

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PULSE CRANKCASE DRIVEN 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