I bought my truck about three wks ago driving home from the dealer water in fuel came on took it back to dealer they drained the frame fuel filter it was okay forabout 100miles then fuel light came back on drove about 300 hundred miles with light coming on and off erratically. On the way home it stayed off and has been off for about 400 miles this morning it came back on while going up a hill and has been going on and off all day I have been triough about a tank and a half of fuel using power servce grey bottle additive. truck was not fully warmed up we have had a few cold mornings could condensation cause this? there is about a half tank of fuel. sorry for the long post new diesel/first time owner thanks.

 

Condensation should't be enough to trigger the light, bad tank of fuel mabye, have you filled up at the same station? Try another station just in case and try running Howe's Lubricator Diesel Treatment, I run this in my cummins and in all my cc fords in the fleet where I work with now issues. Good luck and it's nice to see a local on the site.

 

Keep draining off the filter. Doesn't take much water to trigger the light.

 

when i first got my 05 it started doin the same thing and then the speedometer stopped working. the pretty much replaced the whole dash said there was a short somewhere. no problems since then.