1995 Johnson/Evinrude Outboards 40 thru 55 2-Cylinder Service Manual, Page 84Get this manual
Pulse Limiter Fitting
f11 The pulse limiter fitting for the VRO pulse hose has an integral
r,;;:J clogged check valve will limit fuel and oil supply, causing
serious powerhead damage1Remove the pulse limiter fitting from the pulse hose
check valve The check valve is not serviced separately, but it must be clear to allow normal pump operation
f21 2Backflush the valve with OMC Carburetor and Choke CleantJ
er to remove any carbon deposits
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 blue nipple facing the pump4Secure the pulse hose with ratchet clampsPump For function tests of the System, this sectionpump, refer to Testing Fuel