Duty Solenoid Valve

A duty solenoid, is installed in carburetor. Signals received from the ECM, causes duty solenoid valve to repeat opening and closing in short cycles. The valve is equipped with a control air bleed and a control fuel jet. When current flows through the valve, a plunger inside moves down. This opens port to control air bleed and closes port to control fuel jet.

When there is no current a spring moves plunger up. This closes port to air bleed and opens port to fuel jet. These ports are routed to both the slow and main ports on primary side of carburetor.