1994 Johnson/Evinrude "ER" 60 thru 70 outboards Service Manual, Page 71Get this manual
Pulse Limiter Fitting The pulse limiter fitting for the pulse hose has an integral check valveThe check valve is not serviced separately, but must be clean to allow normal pump operationA clogged check valve might restrict fuel and oil supply, causing serious powerhead damage1Remove the pulse limiter fitting from the crankcasef612Backflush the valve with OMC Carburetor and Choke Cleaner to remove any carbon deposits r::-=J If excessive carbon deposits are found, the engine must be
checked for causes of backfiring before being returned to the customer Incorrect linkage adjustments Incorrect engine temperature Crankcase air leaks Carburetor problems Extended use of flushing attachment3Position the fitting in the pulse hose with blue nipple facing the pump4Secure the pulse hose with ratchet clampsPump For functional tests of the System, this Sectionpump, refer to Testing Fuel