1992 Johnson Evinrude "EN" 40 thru 55 Service Manual, P/N 508143, Page 92Get this manual
Warning Signals Push fuel hose off fuel fittingsdon't pullIf pushing won't separate hose and fitting, carefully cut the hose along its side and peel it back to avoid damaging the fittings"low Oil" Signal complete procedure for testing the "low oil" circuit can be found in Installation Recommendations, this section"No Oil" Signal 1Connect shop tank with 50: fueloil mixture to the fuel inlet fitting2Carefully, cut the oil supply hose from the pump oil inlet fitting3Start the engine and run it at 1000 RPM, in gear4After the residual oil is exhausted from the pump, the "no oil" circuit should activate the warning horn The horn should sound 112 second on, 112 second off5If the horn does not sound within five minutes, check for battery voltage at purple lead, connector terminal "0", when engine is running, and check the tachometer circuit6If battery voltage is present at the pump, the tachometer circuit is okay, and the warning horn circuit is okayreplace the pump