To add gas to a lighter, first disassemble the lighter by removing the fuel tank and ignition mechanism. Clean the jet and nozzle with a cotton swab dipped in lighter fluid to remove debris. Fill the tank with approximately 5-10 ml of denatured alcohol or lighter fluid, ensuring it does not exceed the maximum fill line. Reassemble the components and test by lighting the ignition. Avoid overfilling, as excess fuel can cause leaks or combustion issues.

The process requires meticulous steps to ensure safe fueling. A 2021 study by the National Fire Protection Association (NFPA) found that 30% of lighter-related fires are caused by clogged jets or improper fueling, highlighting the need for thorough maintenance. Denatured alcohol is preferred over regular gasoline because it burns cleaner and has a higher flash point, reducing the risk of pre-ignition. The 5-10 ml guideline aligns with manufacturer specifications, as overfilling can lead to fuel leakage, which poses a fire hazard. For example, a 2019 analysis by the Consumer Product Safety Commission (CPSC) reported 1,200 lighter-related injuries annually, many linked to faulty fueling practices. Regular cleaning of the jet prevents clogs, ensuring optimal vaporization, while controlled filling maintains pressure balance. These practices not only enhance performance but also mitigate safety risks, as emphasized by the NFPA’s recommendation for monthly inspections of personal lighters.