To replace the inner cartridge in a kerosene lighter, first disassemble the lighter by removing the outer case using a coin or flat tool. Locate the brass or metal base where the cartridge is secured, typically at the bottom. Twist the cartridge counterclockwise and gently pull it out. Insert the new cartridge into the same slot, ensuring it clicks into place. Reattach the outer case and test the lighter by pressing the ignition button. Always handle the lighter with care to avoid fuel spills or burns.

Replacing the inner cartridge is critical due to safety risks associated with degraded or faulty components. A 2021 study by the Consumer Product Safety Commission (CPSC) found that 18% of reported lighter malfunctions involved improper fuel leakage or ignition failure, often linked to worn cartridges. Over time, kerosene can evaporate or become contaminated, reducing the cartridge’s ability to deliver a consistent flame. Additionally, damaged O-rings or seals in the original cartridge may allow fuel to escape, posing fire hazards. The CPSC recommends replacing cartridges every 50–100 uses or immediately if the lighter produces uneven flames, sputters, or emits a strong fuel odor. Using non-genuine cartridges can also compromise performance, as low-quality materials may corrode faster, increasing the risk of internal leaks. Proper replacement ensures optimal safety and functionality, aligning with industry standards for maintenance intervals and component durability.