1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, P/N 507875, Page 80Get this manual

1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, P/N 507875, Page 80

Testing Fuel 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 damageAfter you have isolated the component, refer to Servicing, this Section, for specific repair proceduresTesting Procedure

i propellers, twist and remove all spark plug leads

To avoid accidental starting of engine while changing

INotel Some checks require that the engine be run at full throttle under loadInstall the correct test propeller and run the engine in suitable test tank1Start engine and allow it to reach normal operating temperature
rl 2Install OMC Vacuum Gauge PIN 390954 or equivalent em) of clear vinyl hose at the fuel inlet fitting on the lower engine coverSecure all connections with tie straps to eliminate air leakage
tJ and in(20,3

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