gmctd wrote:
The fuel filter element has two sections - the WIF section is media which will pass fuel, but not the denser water, plus it is a centrifugal filter of sorts, where the heavier water component cannot navigate the corners, thus precipitating out and illuminating the WIF indicator - water is electrically conductive - Diesel fuel is electrically insulative
However, fuel can have water component where the ratio of water to fuel is not conductive enuff to trigger the sensor module - you will also know when the w\f ratio becomes excessive by the engine's response: ruff-running, black smoke: water quenches the combustion flame - also, water, at 20000psi, is as damaging as solid particles to the ucron-finished CP3 internals, solenoids, COV valves, and injectors
If you shut it down with no WIF indication, then start it some time later with WIF indication, the water has had time to precipitate out and trigger the alarm, and requires draining - if the alarm retriggers at start-up, you've likely picked up a load of contaminated fuel - if the drained fuel is clear, not cloudy, it can be reused after removing the water from the bottom of the tank - murky fuel is not a keeper
The lift pump pulls fuel from the bottom of the tank
Don't fergit to flush the fuel lines and filter cannister, and replace the filter
Thank you that is more like the answer I was looking for.