There is no universal rule requiring every vehicle to have its fuel door on the left or right. Automakers choose the location based on the vehicle’s engineering, including the position of the fuel tank, exhaust system, suspension, wiring, brakes, and structural components. Engineers must find a safe and practical route for the filler neck without interfering with other systems or crash protection.

Manufacturing considerations also play a role. Moving the fuel door can require changes to body panels, fuel lines, and assembly processes, so manufacturers generally keep the existing design when it works. Safety requirements are also important, including protecting the fuel system during crashes, controlling fumes, and keeping the tank away from excessive heat.

As a result, even vehicles from the same brand can have fuel doors on different sides because they may use different platforms and underbody layouts. The easiest way to know where yours is located is to check the fuel-pump symbol on the dashboard. A small triangle or arrow beside the icon usually points toward the side of the vehicle where the fuel door is located.