1990 Johnson Evinrude "ES" 40 thru 55, P/N 507872, Page 68Get this manual
Fuel Pump Servicing fuel filter and install new filter elementAlso remove the fuel line from the fuel tank and blow through all passages and lines with low-pressure, compressed air to be sure they are openThis 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 replacedTo prevent excessive fuel spillage, disconnect line connector at motor before disassembly
f1l Before replacing suspect fuel pump, remove and clean the
ill motor and squeezing primer bulb until definite resistance is
felt in bulbTo install new filter element, loosen screw and remove cover Do not lose small O-ring from around center post or large a-ring from outer edge of cover Wash filter element
After servicing, check for leaks by connecting fuel line to