How to Open the Gas Tank on an Audi R8

To open the gas tank on an Audi R8, make sure the car is unlocked, then press and release the fuel door on the right-hand (passenger) side; the door will pop open, allowing you to unscrew the fuel cap and refuel. This system is common to both first- and second-generation R8 models, though specific locking behavior can vary slightly by model year and market.

Where the Fuel Door Is Located

The Audi R8’s fuel filler is located on the rear right-hand side of the vehicle, integrated into the bodywork above or just ahead of the rear wheel arch, depending on the generation. It is designed to be flush with the exterior lines, which can make it less obvious at a quick glance, especially on darker paint colors or when the car is dirty.

Basic Steps to Open the Gas Tank

Most R8 models use a “push-to-open” fuel door that is electronically locked when the vehicle is locked and released when the vehicle is unlocked. The process is usually quick and requires no tools or interior levers.

This list outlines the standard step‑by‑step method to open the fuel door and access the gas cap on most Audi R8 models sold in recent years.

1. Ensure the vehicle is in Park (automatic/dual‑clutch) or in neutral with the parking brake engaged (manual).
2. Unlock the vehicle using the key fob or by touching the door handle sensor if equipped with keyless entry.
3. Walk to the right‑hand (passenger) side of the car and locate the round or oval fuel door near the rear wheel.
4. Press firmly on the rear edge or center of the fuel door. You should feel a slight click, and the door will spring open a few centimeters.
5. Pull the fuel door fully open by hand.
6. Unscrew the fuel cap by turning it counterclockwise; many R8s have a holder or tether on the inside of the fuel door to secure the cap while refueling.
7. After refueling, screw the cap back on clockwise until it clicks, then gently push the fuel door closed until it latches flush with the body.

Following these steps will open the gas tank on a correctly functioning R8 in normal conditions and ensure the fuel system is properly sealed again after you finish refueling.

Differences Between R8 Generations

The basic user experience of opening the fuel tank has remained consistent, but there are subtle differences between first-generation (circa 2006–2015) and second-generation (2015–present) R8s, especially around styling and keyless systems.

First-Generation R8 (Approx. 2006–2015)

On first-generation R8 models, the fuel door is typically a circular metal flap on the right rear quarter panel, often with a visible “R8” or Audi branding. It is still a push-to-open design, which unlocks with the central locking system. There is no separate lever under the dashboard or next to the driver’s seat: everything is managed electronically via the lock/unlock system.

Second-Generation R8 (2015–Present)

On second-generation R8s, the fuel door remains on the right side and still operates via push-to-open, but styling is more integrated and can be less prominent visually. The underlying principle remains the same: the car must be unlocked for the fuel door to release when pressed. Many models with keyless entry will automatically unlock the fuel flap when you unlock the doors or approach and unlock via the handle sensor.

If the Fuel Door Will Not Open

Sometimes the Audi R8’s fuel door can fail to open due to a locking actuator problem, freezing conditions, or a battery or central locking fault. In those cases, there are a few troubleshooting steps to try before assuming a major defect.

This list presents common checks and simple troubleshooting measures if the R8 fuel door refuses to open as expected.

• Check that the car is actually unlocked: Confirm the hazard lights flash and the mirrors (if auto-folding) unfold when you unlock the car. Try locking and unlocking again.
• Try a firmer, deliberate press: Push on the designated edge or center of the fuel door with a steady, firm press; do not pry it with tools to avoid paint damage.
• Listen for the actuator: With someone else pressing the fuel door, lock and unlock the car and listen near the fuel flap for a faint click from the locking mechanism.
• Check for ice or debris: In cold climates, ice can seal the door shut. Gently warm the area (e.g., by parking in a garage or using warm—not boiling—water around the edges) and clear any visible dirt or debris.
• Verify central locking operation: If other locks (doors, trunk) are behaving erratically, the issue may be with the central locking system or battery voltage rather than the fuel door itself.
• Consult the owner’s manual: The manual for your specific model year may describe the location of an emergency release cable or specific procedures.
• Contact a dealer or qualified technician: If the flap remains stuck, a workshop can access the actuator from inside the body panel without damaging paint or bodywork.

These steps help determine whether the issue is a simple lock-state or weather-related problem or whether the vehicle needs professional attention to repair the fuel door actuator or locking system.

Emergency or Manual Release Options

On some Audi models, including certain R8 variants, there may be an emergency release for the fuel door located behind an interior trim panel near the fuel filler area (for example, in the luggage compartment or side panel). Access and design vary by model year and body style, so the owner’s manual is the authoritative source. If you suspect an actuator failure, it is safer to follow the manual’s instructions or use a dealer rather than forcing the flap externally, as the paint and hinge can be damaged quickly.

Fuel Type and Cap Handling

The modern Audi R8, particularly V10 models, is designed for high-octane unleaded gasoline—typically 91 or 93 AKI (Premium) in North America, or 95/98 RON in many other markets. Using the correct fuel prevents knocking and protects engine performance. When you open the fuel cap, many R8s provide a molded holder or hook inside the fuel door so you can hang the cap while refueling instead of letting it dangle against the paint or rest on the pump.

Security and Locking Behavior

The fuel door on an Audi R8 is tied to the central locking system for security. When you lock the car, an electronic pin or actuator secures the flap. When you unlock it, that pin retracts, allowing the door to be opened with a push. There is no separate button on the dashboard or driver’s door, which helps keep the cabin layout clean but means that if there is a locking system failure or low battery, access to the fuel filler can be affected. Keeping the battery in good condition and addressing locking anomalies early helps avoid unexpected fueling issues.

Summary

Opening the gas tank on an Audi R8 is straightforward: with the car unlocked, press on the fuel door on the right rear side and it will release so you can unscrew the cap and refuel. There is no interior lever; the fuel flap is controlled by the central locking system and a push-to-open mechanism. If the door does not open, double-check the lock state, look for ice or debris, and, if necessary, consult the owner’s manual or a dealer for information on any emergency release and proper repair of the actuator or locking system.