To find the information:
* Check your owner's manual: This is the most reliable source.
* Look at the fuel filler door: Sometimes the tank size is printed on a sticker there.
* Check the vehicle identification number (VIN): You can use the VIN to look up the specifications online through various resources (though this might require some searching).
* Contact a Dodge dealership: Provide your VIN, and they should be able to tell you the fuel tank capacity.
Without knowing the specific year and model of your Sprinter, it's impossible to give you a precise answer.