1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 159Get this manual
IMPORTANT: Use of enrichener if engine is warm could result in engine flooding
Enrichener Valve Test
Push key (or choke button) inValve should click
No Click Check for battery voltage to YELLOWBLACK wire at terminal block on engine when key (or choke button) is pushed in
Click Squeeze primer bulb until bulb is firmRemove lower hose from fitting on enrichener valvePlace container under valve, then push key (or choke button)Check for fuel flow from fitting