Join Date: Apr 2008
Location: Beeville, TX
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Sounds like one of two possible things. Or both of them together causing the problem. 1. sticky filthy EGR valve 2. stuck variable geometry turbo.
The water in the fuel light is probably just a coincidence, and your filter needs to be drained.
As for the actual problem, I would start by pulling the EGR valve and cleaning it, or replacing it. If you are resigned to replace it anyway, then get out the welder, and weld it shut. Put it back in, and see if your performance improves. It might throw a code or two if you do this.
Option 2 is a rusty crusty turbo charger. The remedy here is to remove the turbo and disassemble, clean, and reassemble the turbo. If you do a Google search about cleaning the VGT (variable geometry turbo) for a 6.0l, you will find a very helpful video. If you can't find the video, just mark the locations of the various parts and how they went together, take a few pictures, and tear into it. You'll see the movable vanes in the exhaust side that need to be cleaned.
I am sure that some body better qualified will chime in here shortly..
Eli Benson - EMT, Ambulance Mechanic
'08 F350 Dually KR - Spartan'd
'07 F250 CC SB 4x4 XLT - SCT /w Innovative Tunes
4 '09 & '10 E350 6.0l ambulances
1 '08 Duramax 6.6 (LMM) van ambulance