Mercedes W164 W211 Engine Pressure Pipe Hose Line OM629 A6290700533

Mercedes W164 W211 Engine Pressure Pipe Hose Line OM629 is an original fuel system component designed for precise fuel delivery in Mercedes diesel engines. Thanks to its factory-spec geometry and perfect fit for the specific engine unit, it ensures stable injection pressure and predictable system operation. This used OEM component provides a reasonable, cost-effective service solution while maintaining the correct engine performance parameters.

Specifications and technical data

• SKU: A6290700533
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6290700533
• Substitutable numbers: A6290700533, A 629 070 05 33
• Category: Hoses, Lines & Pipes

Purpose and function in the fuel system

The described injection pipe is a component of the diesel engine fuel system, responsible for transporting fuel under high pressure between the injection system components. In Mercedes W164 and W211 vehicles with the OM629 unit, a correctly selected injection pipe is crucial for:

• maintaining fuel system tightness under high pressure,
• stable injector operation and uniform fuel dosing,
• reducing vibrations and stress through proper pipe routing,
• reducing the risk of leaks and power drops resulting from leaks.

The original design of the pipe is matched to the specific engine and body, which facilitates installation and allows for maintaining the factory fuel line routing.

Construction and technical features

The pipe belongs to the group of components referred to as Pipes, hoses, and lines, used in the fuel systems of modern diesel engines. The applied geometry and internal diameter are selected to ensure proper fuel flow at high operating pressure, without unwanted drops or cavitation.

The main structural advantages include:

• factory fit for the OM629 unit in Mercedes W164 and W211 models,
• rigid, deformation-resistant construction, reducing the risk of micro-cracks,
• adapted for operation in the engine compartment with elevated temperatures,
• mounting points designed by the manufacturer that stabilize the pipe.

Thanks to this, the component can operate in demanding pressure and thermal conditions typical for modern diesel engines.

Benefits of using an original Mercedes pipe

Using an original injection pipe instead of a worn or damaged component allows for restoring the proper operation of the fuel system without the need to interfere with the fuel installation design. In practice, this means:

• maintaining factory engine performance parameters and refinement,
• reducing the risk of starting problems and power drops,
• easier diagnostics – the system remains compliant with the manufacturer's documentation,
• no need for modifications, custom mounts, or changing the routing of the lines.

Choosing an original Mercedes component is particularly important in the case of high-pressure systems, where precision of workmanship and tightness have a direct impact on the durability of the injectors and the pump.

Component condition and service application

The pipe comes from the group of used parts, which allows for lowering repair costs while maintaining the original manufacturer's specification. This type of component is often chosen as part of:

• repairs after an injection system failure,
• preventive maintenance after signs of corrosion or leaks are detected,
• restoring the completeness of the fuel system after engine disassembly.

Before installation, a standard visual inspection is recommended, as well as installation in accordance with service procedures for the given engine unit, maintaining the correct tightening torques for the connections.

System expansion – related Mercedes components

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as additional fuel lines, return hoses, or breather pipes, check the available parts in the Mercedes pipes, hoses, and lines category.

For owners of diesel cars who are also considering exhaust system modifications or are looking for information on selecting used components, an article describing the practical aspects of installing a sports exhaust may be useful – you can find it here: Second-hand Mini John Cooper Works Pro sports exhaust – guide and FAQ.