H1 V8-6.5L DSL (1998)
Fuel Filter: Description and Operation
Figure 3-4: Fuel Filler Breakdown
Fuel Filter-Water Separator
The filter-water separator is located at the driver side of the engine compartment firewall (Figure 3-4). It performs five functions which are:
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Fuel filtering (2-stage)
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Water separation
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Water detection
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Water drain
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Fuel heater
Fuel filtering and water separation is through a 2-stage, replaceable filter element. The filter second stage causes water to separate from the fuel in the
form of droplets. These droplets are collected in a reservoir at the bottom of the filter element housing. Water is then drained off through a drain valve
and hose. The drain valve is located in the driver side wheel well.
Water detection and fuel heating are controlled by sensors in the filter housing. Water build-up causes the water sensor to activate the instrument panel
"drain filter" warning light. Fuel heating occurs during cold ambient temperatures. It is controlled by a sensor in the fuel inlet port that monitors
incoming fuel temperature. When temperature falls to a point where wax build-up could occur, the sensor activates the heat element within the filter
housing. The heater will continue to operate until incoming fuel temperature is at or above 46 °F (8 °C).
