1995 Johnson/Evinrude Outboards 50 thru 70 3-cylinder Service Manual, Page 71Get this manual
Pulse Limiter Fitting
pulse limiter fitting for the pulse hose has an integral check valve The 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 crankcase
f61 2Backflush the valve with OMC Carburetor and Choke Cleaner 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 For functional tests of the System, this Sectionpump, refer to Testing Fuel