To find out the exact capacity for *your* specific 2001 Chevrolet Silverado, you should:
* Check your owner's manual: This is the most reliable source of information.
* Look inside the fuel filler door: The fuel tank capacity is often printed on a sticker inside the fuel filler door.
Without knowing the specific trim level of your 2001 Chevrolet Silverado, I cannot give you a definitive answer.