Mercedes W639 W906 OM646 Fuel Injector Pressure Rail Line A6460701895

Mercedes W639 W906 OM646 Fuel Rail A6460701895 is an original diesel engine fuel system component, designed for OM646 diesel units in Mercedes Vito/Viano W639 and Sprinter W906 models. This used fuel rail from the injector nozzles category allows for professional repair or reconstruction of the common rail system while maintaining the engine's factory operating characteristics.

Specifications and technical data

• SKU: A6460701895-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6460701895
• Substitutable numbers: A6460701895, A 646 070 18 95, 0445214161, 0 445 214 161
• Fuel type: Diesel
• Category: Fuel Injectors

Application and Function in the Common Rail System

The fuel rail in the OM646 engine plays a key role in stabilizing fuel pressure and ensuring uniform distribution of diesel fuel to individual injectors. In Mercedes common rail systems, it is responsible for:

• maintaining constant operating pressure regardless of the engine's instantaneous load,
• precise fuel supply to diesel injectors,
• limiting pressure pulsations, which translates to smoother, more refined engine operation,
• interfacing with sensors and control accessories of the injection system.

By maintaining its original geometry and flow parameters, the fuel rail supports the correct operation of the engine control unit and the injection system, directly impacting performance, running smoothness, and fuel consumption.

Benefits of Using an Original Fuel Rail

Choosing a genuine Mercedes part over an aftermarket alternative helps maintain the factory fuel system parameters. The main advantages of using this fuel rail include:

• compatibility with the OM646 engine design used in Mercedes W639 and W906 models,
• proper fitment with injector nozzles and high-pressure lines,
• preservation of the manufacturer's specified pressure characteristics, which simplifies diagnostics and tuning,
• stable operation on diesel fuel, crucial for heavy-duty applications (transport, special conversions).

By using an original fuel rail, you minimize the risk of starting problems, power loss, or uneven engine operation resulting from incorrect common rail pressure.

Professional Application in Service and Diagnostics

The Mercedes W639 W906 OM646 Fuel Rail A6460701895 is particularly useful for:

• injection system repairs following injector or high-pressure pump failure,
• diagnosing fuel pressure issues where a tested fuel rail needs to be fitted,
• reconstructing the common rail system after mechanical damage or corrosion of fuel system components,
• fleet servicing, where parameter consistency and quick part replacement are essential.

A used OEM part is a good choice when you aim to maintain the original technical specifications while optimizing repair costs.

Condition, Origin, and Technical Compatibility

This fuel rail is sourced from a dismantled Mercedes vehicle and is offered as a used injection system component. This means you receive a part with factory specifications that has already been operated under real diesel engine conditions. This is particularly important for precise common rail components where the geometry of fuel channels and fitment with accessories are critical.

The product is designed for engines powered by diesel fuel, in line with the OM646 unit's design. Before installation, the standard service procedure is recommended: checking the system for contaminants, high-pressure line tightness, and correct injector operation.

Technical Support and Additional Resources

When working with the common rail system, it's beneficial to be aware of common symptoms of wear and failure in fuel system components. To better understand how to diagnose injection problems in diesel engines, check out the article Diesel Injector Faults – How to Recognize Them and What Neglecting Them Entails, which discusses symptoms, consequences, and basic diagnostic methods.

If you are looking for other Mercedes injector nozzles for your vehicle, explore our dedicated category: Mercedes injector nozzles. Here you will find a wide selection of injection system components tailored to various models and engine versions.

For users interested in the broader use of dismantled parts for servicing this brand of car, the post Used Mercedes Parts – Original Components from Dismantling may also be helpful, describing the advantages of using original, used components in premium vehicles.