Audi A5 B8 8T Fuel Tank - Used Original Parts-8T0201021FK

Diagnosis and Common Symptoms

As a technician evaluating the B8 and 8T chassis, fuel tank replacement is typically mandated by physical damage, structural fatigue, or internal component failure. The most common cause for replacement is impact damage from road debris, which can compromise the structural integrity of the high-density polyethylene, leading to hairline fractures. Furthermore, failure of the internal baffling system can occur over time, resulting in erratic fuel movement and subsequently implausible readings from the fuel level sender unit.

From a diagnostic perspective, a compromised fuel tank will almost certainly trigger EVAP system fault codes. You will frequently see P0456 (EVAP System Leak Detected - Very Small Leak), P0442 (Small Leak), or P0455 (Large Leak) stored in the ECM. Symptoms include a persistent, strong odor of raw fuel near the rear axle or inside the cabin, visible fuel weeping at the tank seams or filler neck junction, and an illuminated Check Engine Light. Due to the pressurized nature of modern EVAP systems, even microscopic stress cracks necessitate complete tank replacement to restore systemic integrity.

Introduction

When addressing fuel system failures on the B8 chassis, utilizing aftermarket replicas introduces significant risks regarding EVAP sealing and crash safety standards. This Genuine Used replacement fuel tank guarantees the exact factory dimensions, material thickness, and precise mounting alignments your vehicle demands. Every unit is rigorously pressure-tested and visually inspected by technicians to ensure it is entirely free of stress fractures or internal debris. By choosing a tested, authentic component, you restore your vehicle to strict factory specifications with absolute confidence.

Product Details

• Brand: Audi
• Model Compatibility: Audi B8 / 8T Chassis (A4, S4, A5, S5)
• Part Name: Fuel Tank
• Part Number: 8T0201021FK
• Condition: Genuine Used (Tested Working)
• Notes: Please verify your specific drivetrain configuration (Quattro versus Front-Wheel Drive) prior to installation, as tank geometry varies. This unit has been visually inspected for internal baffle integrity and external structural soundness, with all breather and EVAP ports confirmed intact.