Mercedes W164 OM629 Diesel Fuel Injection Strip Rail Sensor A6290700795

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W164 OM629 Diesel Fuel Injection Strip Rail Sensor is a precision fuel system component designed to work with the OM629 diesel engine in premium class models. It is responsible for the stable distribution of fuel at the correct pressure to the injectors, which translates into smooth engine operation and predictable throttle response. By maintaining factory geometry and flow parameters, the rail provides a solid foundation for professional fuel system repairs.

Specifications and technical data

• SKU: A6290700795-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6290700795
• Substitutable numbers: A6290700795, A 629 070 07 95
• Fuel type: Diesel
• Category: Additional Fuel Injection Parts

Purpose and function in the fuel injection system

The fuel rail in a diesel engine acts as a common fuel manifold that collects high-pressure fuel and distributes it to individual injectors. In the OM629 unit, this is particularly important, as uniform cylinder fueling affects engine refinement, vibration reduction, and power stability across the entire rev range. A properly selected fuel rail helps maintain correct combustion parameters, which promotes both performance and fuel economy.

This element is crucial when diagnosing problems with fuel pressure, uneven engine operation, or power loss. Replacing the rail with a functional OEM component allows for the restoration of factory fuel system characteristics without the need to interfere with the engine's design.

Benefits of using an original Mercedes fuel rail

Choosing a fuel rail dedicated to the OM629 in the W164 body provides a number of practical advantages in daily operation:

• maintenance of factory fuel pressure characteristics across the entire load range,
• consistency with factory engine management and fuel system sensors,
• reduced risk of leaks and pressure drops in the manifold,
• possibility of installation without structural modifications in the engine bay.

As a result, the diesel fuel injection system can operate under conditions close to factory specifications, which facilitates further diagnostics, tuning, and potential service work on injectors or the high-pressure pump.

Condition, origin, and service application

The offered rail comes from dismantling and is a used component, which makes it an attractive cost alternative to new parts while maintaining the manufacturer's original specifications. This type of component is particularly useful in situations where:

• a quick replacement of a damaged rail is necessary during fuel system repair,
• errors related to fuel pressure appear and other elements have already been ruled out,
• modernization or regeneration work is being carried out on the diesel engine's accessories.

A used fuel rail allows you to optimize your repair budget while maintaining compatibility with the factory fuel supply system in a Mercedes W164 with an OM629 unit.

Part selection and drivetrain compatibility

When selecting a fuel rail for a diesel engine, it is crucial to match it to the specific engine version and accessory configuration. In practice, this means verifying the manufacturer's markings and compatibility with the fuel injection system used in the specific vehicle. Using original components minimizes the risk of installation problems, leaks, or incorrect operation of pressure sensors.

If you are also considering replacing other drivetrain elements or analyzing the cost-effectiveness of using used parts, it is worth checking out practical tips regarding the secondary market. The following article may be helpful: Used gearbox – when is it worth it and what you need to remember, which discusses the approach to purchasing used components, compatibility issues, and the balance of repair costs.

Expansion and service of the Mercedes fuel injection system

During comprehensive maintenance of the fuel system in a Mercedes with a diesel engine, it is common to replace not only the rail but also other elements related to fuel distribution, such as high-pressure lines, injectors, or sensors. If you are planning a comprehensive repair or modernization of the engine area in your Mercedes and need other elements from the same group, such as fuel lines, injectors, or control valves, check the available parts in the category Other Mercedes fuel injection system parts.

This allows you to build a coherent set of components that will facilitate service and reduce vehicle downtime, while also allowing you to maintain uniform quality standards throughout the entire fuel injection system.