6.7 Powerstroke - Water in fuel MSG
Just thought I'd throw this out there as an FYI for those of you with the 6.7. Long story short - If you receive a "Water in Fuel - Drain filter" message, and you drained the filter and didn't find any water there, and the message won't clear, there is a good chance water got into the electrical connector at your separator. So unplug the connection, blow it out dry with a compressor and plug it back in. More importantly yet, you must drive the truck for 5 or so miles at highway speed for the message to clear. Throw a little dielectric grease on the connection while you are at it.
This is the first time I have had any issue with this system and I regularily power wash the underside of the truck. Difference was this time I had brought it in for the annual undercoating and when they power washed the underside it must have gotten in and they must have sprayed high pressure water at the connection directly.
I spent hours on the trying to get opinions from local Ford diesel mechanics but it didn't really help (also doesn't help its a Saturday) None advised me to do this, they all recommended it be brought in and drained and checked out. I found this procedure on a Powerstroke forum. Hopefully nobody will have this headache but if you do, hopefully I can save your guys a bit of headache, money and wasted time.