Mercedes W204 W212 OM651 Fuel Overflow Leakoff Hose Line Pipe A6510700035

Mercedes W204 W212 OM651 Fuel Overflow Leakoff Hose Line Pipe is a specialized component of the diesel engine fuel supply system, designed for the precise drainage of excess fuel from the injectors. Thanks to its compatibility with OM651 units and its application in C-Class and E-Class models, the hose ensures stable operation of the fuel system and helps maintain correct pressure parameters in the diesel installation.

Specifications and technical data

• SKU: A6510700035
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6510700035
• Substitutable numbers: A6510700035, A 651 070 00 35
• Fuel type: Diesel
• Category: Fuel Tanks & Filler Necks

Purpose and function in the fuel system

The fuel overflow leakoff hose in a diesel engine is responsible for the controlled return of excess fuel from the injectors to the circuit, which stabilizes operating pressure and limits the overheating of precision components. In the case of OM651 units, the use of a properly selected hose is important for:

• maintaining uniform injector operation under variable loads,
• reducing the risk of air entering the fuel supply system,
• maintaining correct cold and warm start characteristics,
• limiting uncontrolled fuel leaks in the rail and injector area.

The element belongs to the Fuel tanks and filler pipes group, but structurally it operates directly in the engine supply area, working in conjunction with other components of the diesel fuel system.

Compatibility with the OM651 Diesel engine

The discussed hose has been designed for use in Mercedes vehicles with the OM651 diesel engine, used in, among others, the W204 and W212 series. Proper matching of the hose geometry, connection diameters, and routing method in the engine compartment allows for:

• trouble-free installation at factory mounting points,
• proper routing of the overflow line while maintaining required bending radii,
• reduction of mechanical stress and vibrations transmitted to the injector nozzles.

Thanks to this, the hose can be used as a functional replacement for the factory-installed element in the diesel fuel system, while maintaining compliance with the original design specification.

Characteristics of the used element

The offered fuel overflow leakoff hose is a used element, which in practice means it has been removed from a vehicle and verified for operational suitability. This type of part is a good solution in situations where:

• a quick and economical repair of the fuel system is necessary,
• an element compliant with the factory assembly specification is sought,
• it is important to maintain the original routing of hoses in the engine compartment.

Choosing a used overflow hose allows for reduced service costs while maintaining compatibility with the existing fuel installation in a diesel-powered car.

Technical support and selection by fuel system

When working with a diesel supply system, it is crucial to correctly identify the configuration of the injectors, high-pressure pump, and return elements. To better understand the relationships between these components, it is worth referring to expert material describing the diagnostics and operation of supply systems, available in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration. It allows for organizing knowledge regarding the selection of parts by manufacturer markings and typical symptoms of wear in overflow elements.

Expanding the fuel system in a Mercedes

If you are planning a comprehensive repair or upgrade of the fuel supply area in your Mercedes and need other elements from the same group, such as return lines, sections near the tank, or fragments of the filler pipe, check the available parts in the Mercedes fuel tanks and filler pipes category.

For users considering broader vehicle modifications, including the use of aftermarket components, a guide on selecting used tuning elements may also be helpful, available in the post The best used parts for tuning your car, which discusses the practical aspects of selecting and assessing the condition of used parts.