Your Turbo is not providing boost.
The optional diesel engine in an '04 F250 Ford is a 6.0L V-8 Turbo Diesel made by Navistar (International)
7.3 Liter Turbo
7.3L turbo
Engine air filter
Normally that would be the low fuel warning light
go to a mechanic
The 2003 Ford F250's never came with a 7.8 diesel ... they did however come with a 7.3 diesel turbo charge and are good engines. As for transmissions , all depends what kind ... manual or automatic ?
No spark plugs on a diesel
7.3 turbo takes 12 quarts
Most f250 fuel tanks if single are 24-25 gals
That light is a warning that the fuel/water seperator has collected at least 100cc of water. You should drain the water from the seperator as soon as possible. If it continues usually means you have bad fuel.
on the timing cover sensing the damper