Patent ID: 8887775

Claim:
A system for preventing overflow in a storage tank which is fillable via a nozzle, the system comprising: a guide configured to fit within a fill passage of the storage tank and receive the nozzle; a lower passage configured to fit at least partially within the fill passage of a storage tank and receive at least a portion of a flow of liquid from the nozzle; an upper passage connected to an upper portion of the lower passage; and a valve connected to a lower portion of the lower passage, the valve having a first position and a second position, wherein when a level of liquid in the storage tank is below a predetermined level, the valve is in the first position and liquid is permitted to flow out of the lower portion of the lower passage; and wherein when the level of liquid in the storage tank is at or above the predetermined level, the valve is in the second position and at least partially blocks the flow of liquid out of the lower end of the lower passage.