Circuit Description

WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2002 Saturn Vue, 2002 Pontiac Montana, 2002 Pontiac Aztek, 2002 Oldsmobile Silhouette, and 2002 Oldsmobile Bravada. However, it is still accessible from the selected car via links, so may be relevant.

The fuel manager/filter assembly consists of fuel heater, water-in-fuel sensor and a filter. Filter contains coalescer, the device that combines small droplets of water into larger ones, and filter/separator. A fuel lift pump delivers diesel fuel from tank to fuel filter. As fuel enters filter, fuel passes first though fuel heater. Heater contains a thermostatic switch, which opens or closes to turn heater OFF or ON, depending on temperature of fuel. Fuel then passes through filter and water coalescer, where droplets of water-in-fuel combine into larger drops, that fall into water reservoir in filter. When fuel flows from fuel manager/filter assembly to injection pump, fuel is clean and free of water. Solid state water-in-fuel sensor supplies voltage to a probe. When probe touches water, module closes a switch. This completes a circuit to ground and illuminates water-in-fuel light. A circuit in water-in-fuel module grounds light briefly to test bulb each time system is turned ON.