1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 89Get this manual

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Troubleshooting Fuel Pump (continued) PROBLEM: LACK OF FUEL PUMP PRESSURE Possible Cause Corrective Action
Boost diaphragm gasket Check seal between distorted or out of placemating surfaces wher

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