Rebuilding the new OMC Fuel Pump

The illustrations below are off OMC's fuel pump repair kit instructions #433519 or NAPA 18-7800
This same basic fuel pump was used on many motors from made from about 1987 thru the current models of non VRO for 9.9 hp up to 155 hp

NOTE -- Load times may take a while depending on your computer, as these 2 illustrations are from scanned pages from the original repair kit.

This repair kit is for 1990 and newer 9.9 thru 155 hp model Evinrude and Johnson outboard motors without the VRO Oil Injection System.

Some of the parts in this kit are not used in some applications.   Discard the extra parts.

(1)  Contents of Kit

Disassemble your pump carefully, taking note of the position and orientation of each part.

(2) (3) Place a drop of oil on the stem (A) of each check valve.  Install the check valves by pushing the stem thru the center hole with your finger tip or pencil eraser until the enlarged head (B) is thru the housing.

(NOTE)  Do not use your finger nail, pencil point or ANY OTHER TOOL to install check valves or valve damage and premature failure will result.  Do not assemble check valves into a dry housing, and do not pull valve stem thru the housing.  Never reuse a check valve after it has been installed and removed.  Removing a check valve damages it and reusing valve will result in premature pump failure.

Reassemble pump, hook up fuel tank and squeeze primer bulb to check for leaks.  Fuel leaks could cause fire or explosion.  Repair any leaks before operating motor.

You can see from the above information that this fuel pump is considerably easier to repair than the older one was.

Originated 11-16-06 & last updated 05-29-2007
to contact the author click here