1993 Johnson Evinrude "ET" 60 thru 70 Service Manual, P/N 508284, Page 68Get this manual
Pulse Limiter Fitting
r;l 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 operation
clogged check valve might restrict fuel and oil supply, causing serious powerhead damage
1Remove the pulse limiter fitting from the crankcaser&12Backflush the valve with mild aerosol solvent to remove any carbon depositsIf 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