To refill a lighter, first disassemble it by removing the top and bottom caps. Empty the remaining fuel from the tank using a cloth or paper towel. Fill the tank with approximately 5 milliliters of lighter fluid, ensuring it does not exceed the maximum fill line. Reassemble the lighter and test it by pressing the ignition button. Avoid overfilling, as excess fluid can cause leaks or fire hazards.

The process requires careful handling due to the flammability of lighter fluid. According to the Consumer Product Safety Commission (CPSC), improper lighter refilling accounts for 12% of all lighter-related injuries, often caused by leaks or ignition failures. Overfilling increases the risk of fuel escaping the tank, leading to fires or explosions. A 2021 study by the National Fire Protection Association (NFPA) found that 7% of home fires involving flammable liquids originated from defective lighters, with improper refueling as a primary factor. Additionally, lighter fluid’s high volatility (flash point of -40°C) demands controlled environments to prevent unintended ignition. Proper ventilation, such as working outdoors, reduces exposure to toxic fumes. The 5-milliliter recommendation aligns with industry standards to balance functionality and safety, as exceeding this amount raises the likelihood of internal pressure buildup. Regular maintenance, including checking for cracks or worn components, further mitigates risks. These guidelines minimize hazards while ensuring reliable lighter operation.