1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 117Get this manual

1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 117

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Maintenance Periodically check fuel line and primer bulb for cracks, breaks, restrictions or chafingCheck all fuel line connections for tightnessAll fuel line connections must be clamped securelyPrime