1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 88Get this manual

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Fuel Pumps General Information
Testing
Install clear fuel hose(s) between fuel pump and carburetor(s)Run engine, and inspect fuel passing thru hose(s) for air bubblesIf air bubbles are fou

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