SVX FWD L6-3.3L DOHC (1994)
Fuel Pump Control Unit: Description and Operation
Fuel Pump Modulator
Fuel Pump Control
PURPOSE
Provides a means for the ECU to control fuel pump circuit ground path.
LOCATION
Under the rear parcel shelf.
OPERATION
The fuel pump modulator is similar to an ignitor or power transistor. It acts like a switch. The ECU triggers the switch at rapid intervals,
completing a path to direct ground or through a resistor to ground. The higher the switching cycle (on time vs. off time) the more time the current
path flows to ground. This supplies more voltage to the fuel pump, increasing discharge flow.
