1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 140Get this manual

1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 140

FUEL DELIVERY SYSTEM
Primer System
The primer system provides extra fuel to the outboard whenever the primer knob is pulled outThe primer system components should be inspected carefully for serviceabilityThe diaphragm and gaskets should be inspected for cuts or abrasionsReplace accordinglyThe primer check ball and springs should be inspected for debris, varnish or rust which restrict free movement
SYMPTOMS OF DEFECTIVE PRIMER SYSTEM

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