1997 Johnson Evinrude "EU" 125C, 130, 200, 225, 250 90 LV Service Manual, P/N 507269, Page 91Get this manual
Pulse Limiter Fitting The pulse limiter fitting for the VRO pulse hose has an integral check valveThe check valve is not serviced separately, but must be clear to allow normal pump operationclogged check valve will limit fuel and oil supply, causing serious powerhead damage1Remove the pulse limiter fitting from the crankcase2Backflush the valve with OVIC Carburetor and Choke Cleaner to remove any carbon deposits
INote If you find excessive carbon deposits, check the engine for
causes of backfi ri ng: Linkage adjustments incorrect Engine temperature incorrect Crankcase air leaks Carburetor problems Extended use of flushing attachment
3Clean the threaded portion of the fitting and apply OVIC Pipe Sealant with TeflonInstall the fitting, and secure the pulse limiter with clampPump For function tests of the System, this sectionpump, refer to Testing Fuel