Make sure there is more than 1/8” of fuel visible through viewing window (the lot numbers visible through the viewing window can serve as a guide)Make sure no vapor lock has occurred in fuel tank See “What is vapor lock?” belowMake sure there is a flint in the flint wheel cartridgeMake sure the flint wheel cartridge is inserted properly. See “How do I install a new flint in my BLU Lighter?” belowMake sure the screw is securely tightened on the flint wheel cartridge Follow operating instructionsClick here to view video clip.