Gas tank capacity for a 1990 Dodge Ram 250 van with the 318 8?

The gas tank capacity for a 1990 Dodge Ram 250 van with a 318 engine varied slightly depending on options and configuration. However, the most common capacity was 26 gallons. You should check your owner's manual (if you have it) or look inside the fuel filler door for the most accurate information for your specific vehicle.