Circuit Description

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. As fuel enters filter, fuel passes through fuel heater. Heater contains a thermostatic switch that 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. Fuel heater is operated by a built-in thermostatic switch. Thermostatic switch completes circuit for fuel heater element when thermostatic switch senses a temperature below 46°F (8°C).