This invention provides a fuel system and a vehicle that can improve the ease of leak checking. The fuel system includes: a plurality of fuel storages; filling piping that connects the fuel storages to a filling port in parallel; and supply piping that connects the fuel storages to a fuel supply destination in parallel. An integral manifold is formed by integrating a filling manifold part disposed at a branching point of pipes of the filling piping and a supply manifold part disposed at a branching point of pipes of the supply piping with each other. The integral manifold has a leak checking port configured to allow introduction of a fluid for leak checking into the filling piping and the supply piping.