Original Fuel Line Set / Chassis Fuel Supply Rail – 4K0201544AE

Original factory harness of rigid and flexible chassis fuel lines (complete supply and return line / fuel rail from the tank to the engine compartment – Kraftstoffleitungssatz Unterboden / Kraftstoffleitungen Benzin), designed for Audi A7 Sportback and S7 (4K / 4K8 generation), as well as Audi A6 C8 (type 4K2 / 4K5 / 4KA) produced from 2018 to 2026, particularly for 3.0 V6 TFSI (55 TFSI / 340 hp) petrol versions, S7 models, and units with Mild Hybrid (MHEV 48V) systems and quattro all-wheel drive, based on the modular longitudinal MLBevo platform.

Original VAG fuel supply system component. It consists of precisely bent multilayer polyamide lines and reinforced composite tubes resistant to high operating pressure, biofuels (ethanol), varying temperatures, and aggressive road chemicals. Equipped with factory Quick-Connect push-pull fittings with integrated double sealing O-rings (Viton / FKM) and original vibration-dampening spacer brackets that position the line in the chassis tray. It ensures safe, 100% leak-proof fuel transfer from the fuel tank pump to the high-pressure fuel pump (HPFP) in the engine compartment, as well as the routing of vapors to the charcoal canister system (EVAP).

Technical specifications:

• Catalog part number (OE): 4K0201544AE / 4K0 201 544 AE (and related revisions from the 4K0201544, 4K0201544AC, 4K0201544AD, 4K0201544AF series)

• System / Category: Fuel supply system and chassis lines / Fuel lines, supply rails, fuel tube harnesses (Fuel Line Feed and Return Set Underbody / Kraftstoffvorlaufleitung)

• Fuel type: Petrol (TFSI)

• Design: Multiline set with integrated spacer clips and factory Quick-Connect fittings

• Line material: Multilayer polyamide with low vapor permeability (PA12 / EVOH barrier)

• Fittings: Factory Quick-Connect push-pull fittings with fluoroelastomer sealing

• Mounting location: Vehicle chassis – along the left/center floor tray (from the fuel tank to the engine compartment bulkhead)

• Dedicated model: Audi A7 Sportback / S7 (type 4K8) and Audi A6 / Avant / Allroad (type 4K - C8)

• Dedicated engine: Particularly 3.0 V6 TFSI (55 TFSI / DLZA, DLZB codes) and related TFSI quattro models

• Steering side: Left-hand drive (LHD) and Right-hand drive (RHD) – universal chassis component

• Condition: Original used part (100% functional – in undamaged technical condition, straight lines without kinks or creases, complete Quick-Connect fittings with undamaged locking clips, no brittle rubber components, guiding brackets included)

• Manufacturer: Audi AG / VAG (Original OEM)

Main application:

• Audi:

  • A7 Sportback (type 4K8) – model years 2018 to 2026 (3.0 V6 TFSI 55 TFSI quattro, S7 TFSI engines)

  • S7 Sportback (type 4K8) – model years 2019 to 2026 (petrol versions)

  • A6 / A6 Avant / Allroad (type 4K2 / 4K5 / 4KA - C8) – model years 2018 to 2026 (55 TFSI quattro models)

  • S6 Avant / Saloon (type 4K - C8) – model years 2019 to 2026 (petrol versions)

Fitment guarantee and VIN verification

Every fuel line harness undergoes a pressure test at operating pressure and an inspection of the Quick-Connect locking mechanism before being prepared for shipping.

Fitment / installation note: The initial designation 4K0 (fuel system group 201 / 544) with suffix AE defines a rail precisely profiled for the MLBevo platform chassis geometry with a 3.0 V6 TFSI engine, accommodating the quattro drive shaft outlets and the 48V traction battery installation. Chassis line damage is usually caused by driving over hard obstacles (crushing the tubes and restricting fuel flow) or by breaking the Quick-Connect flanges during improper fuel tank removal. A kinked line causes a drastic drop in the high-pressure fuel pump (HPFP) supply pressure, resulting in engine bogging under load and low fuel pressure fault codes. The original OEM harness guarantees the factory bend radius and trouble-free mounting into the floor clips. Before purchase, we recommend comparing the letter suffix of the old line or verifying it using the vehicle's VIN.