380SL (107.045) V8-3.8L (116.960) (1982)
Frequency Valve: Description and Operation
The frequency valve resembles an electrically controlled fuel injector that has been modified to accept fuel lines at the inlet and outlet. The valve is
installed inline between the lower control plunger chamber and the fuel return, and modulates pressure in the lower plunger chamber depending upon
signals from the ECU. Modulating pressure in the lower plunger chamber alters the pressure differential between the control plunger inlet and outlet,
allowing the quantity of fuel supplied to the injectors to be controlled independent of control plunger position.