Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 176Get this manual
Tracker Valve Engine Off (No Pressure) Engine at Operating Pressures
1Top CoverSpring Retainer (not shown)SpringO-ringDiaphragm (at rest) SeatAir RailAir Passage (from Air Compressor)Fuel Inlet Passage (from Electric Fuel Pump)Diagram Assembly