To find the fuel tank capacity for a specific 7-passenger van, you should:
* Check the owner's manual: This is the most reliable source of information.
* Look inside the fuel filler door: The fuel tank size is sometimes printed there.
* Search online: Search "[Van Make] [Van Model] [Year] fuel tank capacity" on Google or a similar search engine. Sites like Edmunds or Kelley Blue Book may also have this information.
Without knowing the specific van you're interested in, I can't give you a precise answer.