What size are the diesel tanks in a 1997 F 250?

The fuel tank size in a 1997 Ford F-250 depends on the configuration. There wasn't a single standard size. You could find them with either a 30-gallon tank or a 40-gallon tank. To know for sure what size tank *your* specific truck has, you'll need to:

* Check the owner's manual: This is the most reliable source.

* Look at the fuel tank itself: The capacity might be stamped on the tank. This requires getting under the truck.

* Check the sticker inside the driver's side door jamb: This sticker often lists vehicle specifications, but might not always include fuel tank capacity.

Without knowing the specific trim level and options of your 1997 F-250, it's impossible to say definitively.