1994 Johnson/Evinrude Outboards 40 thru 55 Service Manual, Page 90Get this manual
Pulse limiter Fitting
r:jl The pulse limiter fitting for the
VRO pulse hose has an integral check valveThe check valve is not serviced separately, but it 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 pulse hose
rt 2Backflush 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
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