The gas tank capacity of a 2000 Dodge van 1-ton or 2-ton model can vary depending on the specific variant and options installed. However, for most standard models, the gas tank capacity is typically around 35 to 40 gallons.

To get a precise measurement of the gas tank capacity, you can refer to the vehicle's owner manual, consult the manufacturer's specifications, or check the information label located near the fuel filler door. Additionally, you may also try searching for the specific model online or contacting a Dodge dealership for accurate information tailored to your exact vehicle.