Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 329Get this manual
Oil Pump Test NOTE: graduated container is required to perform this test1Connect engine to remote fuel tank containi ng 50:1 fuel oil mi xture (25:1 if during break-in period)
Set Up Instructions for Oil Injection System
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Be careful not to get dirt or other contamination in tanks, hoses or other components of the oil injection system during Installation
2Attach flush device to outboa rd or place outboard in test tank 3Remove top cowling 4Disconnect oil outlet hose (a) from fuel pump fitting
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