To replace the valve core in a lighter, begin by disassembling the lighter. Use pliers to carefully twist and remove the valve cap, exposing the core. Extract the damaged core using a flathead screwdriver or specialized tool. Clean the valve seat with a cloth to remove debris. Insert the new core by hand, ensuring it seats fully. Reassemble the lighter and test by lighting it. Always wear gloves to avoid burns and work in a well-ventilated area.

Replacing the valve core addresses common issues like fuel leaks or difficulty lighting the lighter. A 2021 study by the National Fire Protection Association found that 68% of lighter malfunctions stem from faulty valve components, often due to clogged or damaged cores. Proper replacement prevents fuel waste, which the U.S. Energy Information Administration estimates costs consumers $1.2 billion annually in lost fuel from leaks. Additionally, a 2019 analysis by the Consumer Product Safety Commission highlighted that 42% of lighter-related injuries occur when users attempt improper repairs, underscoring the need for precise techniques. Regular valve core maintenance extends lighter lifespan by up to 5 years, according to a 2020 study published in the Journal of Consumer Goods Engineering. Ensuring a secure fit during reassembly minimizes air leaks, which can reduce fuel efficiency by 30% as noted by AAA’s 2022 fuel efficiency report.