Audi A5 8T Q7 4L Fuel Leak Off Return Pipe Hose Line 3.0 TDI CAPA 059130218H

Audi A5 8T Q7 4L Fuel Leak Off Return Pipe Hose Line 3.0 TDI CAPA is an original component from the Lines, hoses and pipes group, designed for the 3.0 TDI diesel engine fuel system. It ensures stable fuel return from the injectors, which promotes smooth engine operation and reduces the risk of leaks in the return circuit.

Specifications and technical data

• SKU: 059130218H-3
• Mark: Audi
• Condition: Used
• OEM Part Number: 059130218H
• Substitutable numbers: 059130218H, 059 130 218 H
• Category: Hoses, Lines & Pipes

Purpose and function in the fuel system

The fuel leak off return pipe in Audi A5 8T and Q7 4L models with the 3.0 TDI CAPA engine is responsible for draining excess fuel from the injectors back into the system. A correctly selected and sealed component:

• stabilizes pressure in the fuel rail,
• reduces fuel foaming and dose fluctuations,
• decreases the risk of air entering the system during startup,
• supports smooth, quiet engine operation across the full load range. Thanks to its factory-fit design for the specific 3.0 TDI CAPA configuration, the pipe maintains the correct routing geometry, which facilitates installation and minimizes stress on the injector ports.

Construction and fitment for Audi

The offered pipe comes from the Audi line, which means it retains the original design with properly shaped branches and connectors. The layout of the connections is consistent with the factory setup on the 3.0 TDI engine, so the component:

• fits standard mounts and brackets,
• requires no modifications or shortening,
• maintains a safe distance from hot engine components. Such fitment reduces the risk of abrasion and leaks, which is important for both durability and vehicle safety.

Benefits of using an original leak off pipe

Using an original fuel leak off pipe in an Audi A5 8T or Q7 4L allows you to maintain the fuel system's operating parameters in accordance with the manufacturer's specifications. In practice, this means:

• more predictable engine behavior during cold starts,
• stable idle operation,
• reduced risk of fuel leaks in the engine bay,
• easier diagnostics of potential injector faults. For users who service their car consciously, choosing such a component is a compromise between cost control and maintaining the factory performance characteristics of the 3.0 TDI unit.

Condition and service application

The fuel leak off pipe is offered as a used Audi part, which allows for lower repair costs while maintaining the original design. It is particularly useful in situations where:

• the existing pipe shows signs of hardening or micro-cracks,
• there are fuel leaks around the injectors,
• it is necessary to replace the return components after replacing the injectors. Selecting a pipe compatible with the 3.0 TDI CAPA unit reduces the risk of installation problems and speeds up service work. If you are planning a comprehensive repair or upgrade of the fuel system area in your Audi and need other components from the same group, such as flexible lines, return hoses, or supply pipes, check the available parts in the Audi lines, hoses and pipes category. For drivers interested in a broader approach to reducing service costs while maintaining quality, it is worth checking out the guide on selecting original used parts – more information can be found in the article Reliability and dynamics in Seat models – how to reduce repair costs by choosing factory parts from dismantling?.