Oiling System Tests
Oil-to-Fuel Check Valve Test
The oil-to-fuel check valve controls oil that flows into the outboard fuel system. Oil is injected into the incoming fuel supply before the fuel lift pump.
IMPORTANT: Temporarily disconnect fuel supply hose to relieve pressure in the hose.
- Using a marker or pen, mark the position of the oil hose, relative to the hose retaining mechanism, before removing hose.
- Release the hose by depressing outer ring of the retaining mechanism.
- Remove oil-to-fuel check valve.
- Connect a 30 psi (207 kPa) pressure tester to the inlet side of the check valve. Apply pressure to the check valve. The check valve should not require more than 3 psi (21 kPa) to open.
- Connect a vacuum tester to the outlet side of the check valve. Apply vacuum to the check valve. The valve should not require more than 6 in. Hg to open.
- Install check valve and secure with clamp.
- Make sure the hose support is in the distribution hose and insert oil-to-fuel distribution hose into check valve to proper depth. Run outboard and check for leaks. Repair all leaks.
LOW OIL Sending Unit Test
- Remove the oil from the oil tank, and turn the key switch ON. The LOW OIL light of the System- Check gauge should activate. Once the warning has been verified, turn the key switch ON and refill the oil tank. Confirm that the LOW OIL warning stops as the oil level exceeds one-quarter of oil tank's capacity.
NO OIL Warning Test
STEP 1
Monitor the voltage on the oil pressure switch circuit at pin 5 (tan/white wire) of oil tank connector with outboard running at 1500 RPM.
Use Electrical Test Probe Kit, PIN 342677, and digital volt meter calibrated to scale that reads 12 V (DC). Connect positive meter lead to pin 5 and negative meter lead to ground.
Voltage reading should be approximately 13V, and drop approximately 2 V as EMM actuates oil pressure switch.
STEP 2
Temporarily disconnect the tan/white wire from the oil pressure switch connector. Run the outboard at IDLE. The System Check NO OIL warning should activate (10 seconds), EMM LED should light, and Code 38 should be stored in the EMM.
Turn the key switch OFF and reconnect tan/white wire into electrical plug. START the outboard. The NO OIL warning should not activate.
Results:
- NO OIL warning activates, EMM LED lights, and Code 38 is stored: the system is functional.
- NO OIL light activates but the horn does not sound: faulty horn, horn wiring, or gauge.
- No warning at all: check electrical circuit (tan/white wire) for oil pressure switch and oil tank connector ground circuits.
