RepairPal Certified shops can diagnose and repair your 1996 Ford F-350. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Chck price on aftermarket replacment tank. Do you have your own (private) fuel supply? Or does it sit around with say 1/2 tank, or less, of fuel.
Unusual problem on a Diesel, at least at at my shop.