1992 Johnson Evinrude "EN" 40 thru 55 Service Manual, P/N 508143, Page 86Get this manual
Pulse Limiter Fitting
rv check valveThe fitting valve isVRO pulse hose has an integral The pulse limiter for the check not serviced separately, but it
must be clear to allow normal pump operation
rr:i=J clogged check valve will limit fuel and oil supply, causing
serious powerhead damage1Remove the pulse limiter fitting from the pulse hosef212Backflush the valve with mild aerosol solvent to remove any carbon deposits
rr:i=J If 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
3Position the fitting in the pulse hose with black nipple facing the pump4Secure the pulse hose with ratchet clampsPump For function tests of the System, this sectionpump, refer to Testing Fuel