Join Date: Dec 2008
Location: Spokane WA. area
Thanked 990 Times in 755 Posts
Early 6.0L like my 03' model came with a fuel heater in the frame rail fuel filter unit or as its called the hfcm (horizontal fuel conditioning module). I treat my fuel early on at the onset of winter using double doses of Stanadyne performance formula. I have never gelled even in sub zero conditions like -20F. I also run a fuel pressure gauge tapped into my secondary fuel filter bowl so I can monitor actual fuel pressure while driving, must be above 55psi, mine maintains 70-75 psi with the blue spring mod in the pressure regulator.
Later model 6.0L, like mid 04' and newer, Ford stopped installing the fuel heater in the hfcm. This makes these models more susceptible to fuel issues.
Treating the fuel early on before the cold hits is key, treating untreated fuel after it's already cold is not as effective, unless done indoors.
Diesel fuel in different regions is treated differently, there is no set standard, so you really don't know what the treated level is coming out of the pump in most cases.
One key when refueling to watch for is, if the fuel is pumping very slowly out of the pump nozzle, then likely the filter in the fuel station pump is clogging-waxing already because the fuel is not treated properly. Go to a station that the pump nozzle is flowing strong.
Jan 03' built 6.0/F250cc4wd trqsft/SCT-tuned by KEM-Performance/Garrett Powermax vg-turbo/blue spring mod/gauges=egt+boost+fuel+SG2/exhaust/airaid intake/DR 4.5 lift/dual bilsteins/315's/greasable ball joints/powerstop/smittybuilt/kc lights/high idle mod/roll-n-lock/Mobil Delvac1 ESP 5W40 with (Archoil AR9100 in the oil) and (AR6200 in the fuel)