Drain the water separator into a glass jar and see how much water is actually in the fuel. Sounds like it's doing it's job and has collected enough to set off the alarm. Basically it's just a couple of contacts at the bottom of the collector, when water (heavier than diesel) builds up enough, it will bridge the contacts.
You do NOT want an emulsifier in the fuel that would hold the water in suspension, you want to keep it separated so it can be expelled. The common rail diesels don't like any water in the high pressure fuel pump, bad things happen, and no warranty will cover it.
You do NOT want an emulsifier in the fuel that would hold the water in suspension, you want to keep it separated so it can be expelled. The common rail diesels don't like any water in the high pressure fuel pump, bad things happen, and no warranty will cover it.