Mithell Manuals online 14.99 a month. You won't find it for free. local library brought up the vacuum diagram on the computer for me cost 25 cents 25 cents was for print out
This really depends on what engine your F-350 has in it and if it is equipped with the California Emissions system. If you have a 7.5L EFI engine, then the vaccuum diagram will be located on the air filter housing cover. we have looked everywhere there is no diagram to be found it is a 7.5 efi and not california emission.