FAST FILL SYSTEM FOR REPLACEMENT FUEL TANK

A fast fill system is provided. The fast fill system includes first and second high flow roll-over valves, each coupled to flexible tubes. The system includes a replacement fuel tank with first and second inserts on top. The high flow roll-over valves couple to the replacement fuel tank through the respective inserts. The valves with flexible tubes allow the replacement fuel tank to expel up to 400% more air when refueling than without them. This enables filling by high-flow truck stop pumps at rates of 25+ gallons per minute without pressure buildup or spillage.