K Yukon/Denali 4WD V8-6.5L DSL Turbo VIN S (1999)
Fuel: Description and Operation
Water In Fuel Sensor
The design of the fuel manager/filter includes an area that allows water droplets (as small as one micron) to separate from the fuel and collect in a lower
portion of the housing. The water in fuel sensor will detect a certain amount of water in the fuel inside the filter housing and then turn the Water in Fuel
lamp ON in the instrument cluster.
When the ignition switch is first turned to the run position, the Water in Fuel lamp will come ON for 2 to 5 seconds. This action provides a bulb check.
