Audi A8 D4 Fuel Tank Pressure Regulator Valve Diesel 4H0201559C

Audi A8 D4 Fuel Tank Pressure Regulator Valve Diesel is a precision fuel system component responsible for controlling tank pressure in diesel engines. Thanks to its design, it supports stable operation of the fuel supply system, which translates into smooth engine performance and correct interaction with the control electronics. This solution is intended for users who expect consistency in fuel system operating parameters and compliance with factory Audi standards.

Specifications and technical data

• SKU: 4H0201559C
• Mark: Audi
• Condition: Used
• OEM Part Number: 4H0201559C
• Substitutable numbers: 4H0201559C, 4H0 201 559 C
• Fuel type: Diesel
• Category: Air Intake & Fuel Sensors

Purpose and role in the fuel system

The described valve is a component from the Air and fuel intake sensors group, operating within the diesel engine fuel supply system. Its task is to regulate and stabilize pressure within the fuel tank so that fuel is delivered to subsequent system components under conditions specified by the vehicle manufacturer. A properly functioning pressure regulator reduces the risk of malfunctions in the pump, injectors, and venting systems, which is important for both component durability and engine refinement.

Benefits of using an original Audi component

Using a valve dedicated to the Audi A8 D4 allows for maintaining the structural consistency of the fuel system with the manufacturer's factory specifications. Proper matching in terms of operating characteristics, flow, and interaction with control electronics reduces the risk of diagnostic errors and incorrect sensor readings. For the user, this means:

• more predictable vehicle behavior under various load conditions,
• stable operating parameters of the diesel engine,
• reduced risk of leaks and improper fuel tank venting.

Technical characteristics and compatibility

The regulator has been designed to work with a Diesel fuel system, which means it is adapted to the higher operating pressures and the specific nature of fuel used in diesel engines. The valve design takes into account requirements regarding resistance to temperature changes, vibrations, and contact with oily fuel, typical for modern diesel units. As a result, the component can operate in a repeatable and predictable manner over a long service life, provided that proper installation and maintenance conditions are met.

Condition, origin, and service application

The offered valve belongs to the group of used parts, which allows for an economical repair of the fuel system while maintaining the original manufacturer's specifications. This type of component is particularly useful in situations where problems with tank venting, fuel pump malfunctions, or pressure-related system errors occur. Replacing a worn-out regulator with a functional salvaged part is often an effective way to restore correct operating parameters without the need to interfere with other subassemblies.

Technical support and component selection

When selecting a fuel tank pressure regulator valve, it is worth paying attention to compliance with the manufacturer's markings and the engine type. Both catalog data and vehicle service documentation can be helpful. For users who want to deepen their knowledge about the diagnostics and operation of the fuel system, an article describing the operation of injectors, pumps, and the fuel tank will be useful – a detailed discussion can be found in the material Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

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 pressure sensors, flow measurement elements, or additional regulators, check the available parts in the Audi air and fuel intake sensors category.