An assembly bracket system is provided. The system includes a first bracket portion and a second bracket portion. The first bracket portion is configured to be attached to a vehicle tailgate. The second bracket portion is configured to be attached to a vehicle fuel system. The first bracket portion and the second bracket portion are configured to be engaged to each other in a manner that limits at least one degree of freedom of the vehicle fuel system relative to the vehicle tailgate while allowing pivoting of the second bracket portion relative to the first bracket portion.