Every time you stop at the gas station, you might be doing something that’s secretly harming your car — and 95% of drivers have no idea. In this video, we reveal what you should never do before filling up your gas tank, and why this simple mistake can shorten your engine’s life and waste your money. Many drivers think refuelling is harmless, but there’s real science behind how fuel vapors, static electricity, and fuel-system pressure work. We’ll explain how one wrong move can trigger fuel system problems, damage injectors, or even trip your check-engine light. You’ll learn the truth about gas tank safety and discover small but crucial car maintenance tips that keep your vehicle running smoothly for years. Mechanics warn that skipping these steps can lead to expensive repairs or poor fuel economy — all from a few seconds of bad habit. We’ll also show practical engine care advice to help prevent carbon buildup, fuel contamination, and sensor damage caused by improper refuelling habits. These are proven car repair prevention methods that real mechanics use every day. Whether you drive a small sedan or a full-size truck, these insights will protect your car and save you hundreds in unnecessary repairs. Watch until the end to see the right way to fill your tank — and the one mistake that almost everyone makes. #CarMaintenance #FuelSystem #MechanicTips