1999 "EE" Outboards Accessories Service Manual, P/N 787026, Page 151Get this manual
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34Located under the trim check valve is one return spring for the pump control pistonUsing long-nosed pliers, remove the springDo not attempt to remove the pump control piston35Using drag link socket or similar tool, remove the reverse lock check valve
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36Using long-nosed pliers, remove the pump control piston and spring
37Clean and inspect the components of the pump control pistonReplace if necessaryBoth of the springs are identical and can be interchanged38Service the three short valves and one long valve as follows: