1998 Johnson Evinrude "EC" 2 thru 8 Service Manual, P/N 520202, Page 59Get this manual
Fuel Pump Servicing Before replacing suspect fuel pump, remove and clean the fuel filter and install new filter elementAlso, remove the fuel hose from the fuel tank and blow through all passages and hoses with low-pressure compressed air to be sure they are openThis might be the cause of inadequate fuel deliveryIf this procedure does not correct the trouble, test the fuel pump[] To service filter, loosen the screw and remove the cover
W Wash filter element with clean solvent and brushW Install filter with its lip facing the gasket Install the cover and tighten its screw securelyFunction Test Conduct this test with the motor in test tank or on the boatBefore testing, loosen fuel tank gas cap momentarily to release any pressure that may have built upFuel tank must not be more than 30 in(76 cm) below fuel pump