1990 Johnson Evinrude "ES" Colt/Junior thru 8 Service Manual, P/N 507870, Page 69Get this manual
Fuel Pump Servicing Before replacing suspect fuel pump, remove and clean the fuel filter and install new filter elementAlso remove the fuel line rom the fuel tank and blow through all passages and lines with low-pressure, compressed air to be sure they are open This may be the cause of inadequate fuel delivery, and if so, would eliminate unnecessary replacement of the fuel pumpIf this procedure does not correct the trouble, fuel pump is probably malfunctioning and should be replaced
tJ the fuel pump cover to the fuel pumpWhen installing the filter elementplace the lip of the element toward the gasket Install the fuel pump cover and tighten the screw securelyFunctional Test