2007 Evinrude E-Tec 75, 90 HP outboards Service Manual, Page 188Get this manual
OILING SYSTEM OILING SYSTEM TESTS
Oil-to-Fuel Check Valve Test
The oil-to-fuel check valve controls oil that flows into the outboard fuel systemOil is injected into the incoming fuel supply before the fuel lift pump
the oil tankConfirm that the LOW OIL warning stops as the oil level exceeds one-quarter of oil tank's capacity
NO OIL Warning Test
STEP Monitor the voltage on the oil pressure switch circuit at pin (tanwhite wire) of oil tank connector with outboard running at 1500 RPMUse Electrical Test Probe Kit, PN 342677, and digital volt meter calibrated to scale that reads 12 (DC)Connect positive meter lead to pin and negative meter lead to ground