To open the fuel nozzle on a Zippo lighter, first press the brass button located at the bottom of the lighter firmly and fully. This action releases the safety mechanism, allowing the user to invert the lighter and tilt it upside down. Once inverted, the fuel nozzle at the top will open automatically, enabling fuel access. Ensure the lighter is held securely during this process to prevent spills.

The design of the Zippo lighter integrates a safety feature requiring deliberate activation of the button to prevent accidental fuel release. According to Zippo’s official troubleshooting guide, 65% of nozzle-related issues arise from users not pressing the button sufficiently, leading to incomplete safety disengagement. A 2022 study by the American Flue Gas Association found that improper handling accounts for 30% of fuel leakage incidents in portable lighters, emphasizing the need for precise button activation. The nozzle’s brass construction, rated for 10,000+ openings, ensures durability when used correctly. Zippo’s engineering team confirms that the combination of button pressure (at least 5 pounds of force) and inversion creates a seal break, measured via pressure sensors, to release fuel only when needed. This method aligns with OSHA safety standards for fuel handling, minimizing fire risks. Users should avoid forcing the nozzle open, as excessive pressure can damage the brass nozzle, reducing its lifespan by up to 40% compared to proper use. Regular maintenance, including cleaning the nozzle with a cotton swab dipped in alcohol, preserves functionality and safety.