1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 122Get this manual
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Bleeding Air from Oil Injection System IMPORTANT: If air exists in either oil pump hose (inlet or outlet), the air MUST BE bled from the hose(s) before operating engine
aOutlet HoseFuel Pump Fit