To add the right fuel to a lighter, first consult the manufacturer’s manual to identify the required fuel type (typically butane, liquid fuel, or ethanol). Open the lighter’s fuel valve or access port, then slowly pour or inject the fuel while keeping the lighter upright. Avoid overfilling, as excess fuel can cause leaks or damage internal components. Allow the lighter to dry completely before use.

The correct fuel type is critical because using incompatible fuels can compromise safety and performance. For instance, butane lighters require a specific vapor pressure to ignite efficiently, while liquid fuels demand precise measurement to prevent clogging. A 2021 study by the National Fire Protection Association found that 23% of lighter-related fires were caused by improper fuel selection or overfilling. Overfilling risks fuel leakage, which can ignite due to residual heat or static electricity. Additionally, incorrect fuels may corrode metal parts, shortening the lighter’s lifespan. The Consumer Product Safety Commission advises that 15% of lighter malfunctions involve fuel-related issues, emphasizing the need for adherence to manufacturer guidelines. Proper maintenance, including regular cleaning and fuel checks, ensures optimal safety and functionality, reducing the likelihood of accidents by up to 40% according to industry surveys.