1996 Johnson Evinrude "ED" 60 LV 90, 115, 150, 150C, 175 Service Manual, P/N 507127, Page 70Get this manual
Pulse Limiter Fitting r;;] The pulse limiter fitting for the VRO pulse hose has an
L!J integral check valveThe check valve
is not serviced separately, but must be clear to allow normal pump operationA clogged check valve will limit fuel and oil supply, causing serious powerhead damage
1Remove the pulse limiter fitting from the crankcase
Backflush the valve with OMC Carburetor and Choke Cleaner to remove any carbon depositsIf you find excessive carbon deposits, check the engine for causes of backfiring: Linkage adjustments incorrect Engine temperature incorrect Crankcase air leaks Carburetor problems Extended use of flushing attachment