FE120 L4-4.9L DSL Turbo (2005)
Water In Fuel Sensor: Description and Operation
Fuel Filter
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The fuel filter removes impurities in the fuel through the filter element and also separates water from fuel.
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The water that has been separated from the fuel collects at the bottom of the fuel filter. A water separator sensor is installed in the fuel filter, which
activates the warning lamp on the meter cluster when the water reaches a certain level.
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The water can be drained through the drain port by loosening the water separator sensor.
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A priming pump is provided at the fuel filter head. The priming pump is used for air-bleeding the fuel system.
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When the fuel temperature rises, the thermostat swells and the valve of the fuel filter head is closed. The high-temperature fuel entirely returns to
the fuel tank through the fuel return pipe.
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When the fuel temperature lowers, the thermostat does not swell and the valve to the fuel filter remains open. The high-temperature fuel returning
through the fuel return pipe is let through the valve to mix into the fuel around the element. The fuel around the element is warmed as a result and
wax in it (precipitated when the fuel temperature is low) is dissolved to prevent clogging of the element.