Use a breaker bar in the belt tensioner to relax tension and then remove/replace belt
how to install a serpentine belt on 1989 f250 diesel 7.3l
release the tensioner with a 1/2 in braker bar or ratchet and work the belt out.
No spark plugs on a diesel
Most f250 fuel tanks if single are 24-25 gals
ask a engineer
Your Turbo is not providing boost.
1994-2003
The 2003 Ford f250 did not come with an air cabin filter. There was a dealer install option but very few were ever put in.
The oil capacity for the 6.0 Powerstoke Diesel is 15 quarts.
I know that the 2003 ford f250 diesel was what they call the lemon year. They swiched from a 7.3 to 6.0
on top of the engine there is to caps its the larger of the two the smaller one is the secondary fuel filter. Remove the cap the oil filter is inside.
You will find that on the drivers door manufacturers sticker.