From the 95 owners manual for F250 regular cab.
Front 19.0 rear 18.2, some 4x2 diesels 20.0 front tank, some 4x4 diesels with E4OD 22.0 and all EFI motors 16.5.
F250 super cab and F350 crew cab and super cab
Front 19 rear 18.2, all.
In the Powerstroke supplement book it says diesels should never use more than 90% of the tank capacity as it can pull air witch could damage the fuel pump. Then it notes that diesels have a strainer bypass for cold starts and this can pull air in winter cold start up if you run below 1/4 tank at cold start up. It says this is due to the fuel jell may plug the strainer in very cold start up.
Thats some good info, thanks for asking, I would never looked it up other wise.