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How often should I drain the water/fuel separator?
I've got a 1998 E350, and the Water in Fuel light hasn't come on for over a year now, even though we've had the wettest winter in 10 years. The lamp works because it lights during the indicator check when I first start the engine. But that's it.
I finally drained the fuel/water separator last week, just to see what's going on, and it didn't look like there was any water in there, just fuel.
Should I drain it even if the indicator isn't coming on? How often?
And how would I test that the WIF sensor is working properly?