* 19 gallons: This was the most common size.
* 20 gallons: Some models, particularly those with certain options or for specific markets, might have had a 20-gallon tank.
To know for sure what size tank *your* 1998 Jeep Cherokee has, the best thing to do is check the owner's manual or look at the sticker on the driver's side doorjamb (often listing the vehicle's specifications, including fuel tank capacity).
