1990 Johnson Evinrude "ES" Cross V 88 thru 115, 150 thru 175, P/N 507874, Page 61Get this manual
Testing VRol System Purpose The following procedure is designed to help you isolate defective component in the boat or engine fuel systemThe problem might cause loss of engine performance or, if left unrepaired, might cause serious powerhead damage After you have isolated the component, refer to Se rvicing, this Section, for specific repair proceduresTesting Procedure
i propellers, twist and remove all spark plug leads
"" To avoid accidental starting of engine while changing
INote Some checksInstall the correctenginepropelleratand run the require that the be run full throttle under loadtest
engine in suitable test tank1Start engine and allow it to reach normal operating temperature
2 Install OMC Vacuum Gauge PI 390954 or equivalent and in ,(20,3 cm) of clear vinyl hose at the fuel inlet fitting on the lower engine coverSecure all connections with tie straps to eliminate air leakageDo not use fuel primer bulb, manual fuel primer pump or electric fuel primer pump to restart engine Fuel system pressure could cause immediate damage to vacuum gauge