Break it down Melt Down is a high effective formula specifically formulated to provide significant performance benefits in all diesel fuels, including ultra low sulfur diesel and bio-diesel fuel blends. Melt Down is specifically formulated to dissolve gelled fuel back into solution and return the flow in approximately 20 minutes. It will not harm fuel pumps, nozzles, or any pre-combustion components. Meltdown is an emergency fuel treatment only. For preventative maintenance in applications using diesel fuel use either FPPF Total Power or FPPF Polar Power. For applications involving Home Heating Oil, Heating Oil, or Bunker Fuels use FPPF HOT 4 In 1.