Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 132Get this manual

Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 132

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Testing Fuel Pump 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 found, see "Air Bubbles in Fuel Line