1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 112Get this manual

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IMPORTANT: Use of enrichener if engine is warm could result in engine floodingENRICHENER VALVE TEST Push key (or choke button) inValve should click
Fuel Flow from Fitting Valve is O.KCheck hoses

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