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Ensuring the purity of your fuel supply is a critical aspect of truck maintenance, and this begins with selecting reliable Foton truck parts. The OEM component P558000, known as the Filtre Separateur (equivalent to SN1212), is a high-efficiency fuel water separator and filter designed specifically for FOTON trucks. This dual-function component plays a vital role in protecting sensitive fuel injection systems from both particulate contamination and damaging water ingress. By choosing the genuine P558000 filter, you are making a direct investment in your engine’s longevity, fuel efficiency, and overall operational reliability.
Filtre Separateur – Equiv Sn1212
Топливный фильтр-сепаратор воды – Эквив Sn1212
Filtro Separador de Agua – Equiv Sn1212
The P558000 is an essential component in the fuel system of modern FOTON trucks. It serves two primary, critical functions: filtering solid contaminants from the diesel fuel and separating emulsified water from the fuel. Water in the fuel system can cause corrosion, microbial growth, and catastrophic damage to high-precision fuel injectors and pumps. The filter-separator with part number P558000 is engineered to meet the rigorous demands of commercial trucking, providing a first line of defense that safeguards your engine’s most expensive components.
The P558000 operates on a multi-stage principle to ensure fuel purity. First, the fuel passes through a primary filter media that captures particulates like rust, dirt, and other abrasive solids. Subsequently, the fuel enters a separation chamber, often utilizing centrifugal force or coalescing media, where water droplets are forced to combine and fall out of suspension into a collection bowl at the bottom of the unit.
High-Efficiency Water Separation: The P558000 is designed to remove over 95% of emulsified and free water from diesel fuel. This is achieved through advanced coalescing technology or centrifugal separation, effectively shielding downstream components from water-related damage.
Multi-Stage Filtration: It combines a robust particulate filter with the water separator in one compact housing. The filter media is designed for high dirt-holding capacity, extending service intervals while maintaining consistent flow rates and low pressure drop.
Modern common-rail diesel engines, like those found in FOTON trucks, operate at extremely high pressures with tolerances measured in microns. Even minuscule amounts of water or particles can cause rapid wear, clogging, and failure of injectors and high-pressure pumps. The cost of repairing or replacing these components is substantial.
The P558000 filter-separator acts as a guardian for this expensive system. By removing contaminants before they reach the engine, it directly prevents abrasive wear, corrosion, and injector nozzle coking. This not only avoids major repairs but also maintains engine efficiency, power, and emissions compliance over the vehicle’s lifespan. Neglecting this filter can lead to decreased performance, increased fuel consumption, and ultimately, catastrophic engine failure.
The P558000 fuel water separator is designed for a broad range of FOTON trucks, particularly models equipped with modern diesel engines from suppliers like Cummins, Weichai, and others. Its equivalency to SN1212 makes it a common part in global parts databases.
It is crucial to verify compatibility with your specific truck model, engine type, and model year. While the P558000 is a standard reference, always cross-check with your vehicle’s service manual or use a VIN decoder with an authorized parts supplier. This ensures the unit has the correct thread sizes, flow capacity, and electrical connections (for the WIF sensor) for seamless integration into your truck’s fuel system.
Replacing the P558000 is a standard maintenance task but requires care to prevent air ingress into the fuel system. The general process involves safely depressurizing the fuel system, disconnecting the fuel lines and electrical connector (if present), removing the old filter assembly, and installing the new one.
General Replacement Steps:
1. Locate the filter assembly, typically mounted on the chassis frame or engine bay.
2. Place a drain pan beneath the filter. Open the manual drain valve to empty any collected water and fuel from the bowl.
3. Use a filter wrench to loosen the filter housing or cartridge. Carefully disconnect the fuel lines and electrical plug for the WIF sensor.
4. Remove the old P558000 assembly. Clean the filter head mounting surface thoroughly.
5. Lubricate the new filter’s sealing gasket with clean diesel fuel.
The service interval for the P558000 varies based on fuel quality, operating environment, and the truck’s duty cycle. Typical manufacturer recommendations range from 15,000 to 30,000 kilometers, or as indicated by the vehicle’s maintenance minder or water-in-fuel warning light.
Regardless of mileage, the filter should be inspected regularly. Visually check the transparent bowl for accumulated water and drain it whenever the level is significant or when the warning light illuminates. Never allow the water to reach the level where it could be drawn back into the fuel stream. A best practice is to drain a small amount from the valve during your daily pre-trip inspection, especially in humid climates or after refueling from unfamiliar sources.
Always use genuine replacement parts like the P558000. The filter media and sealing components are specifically engineered for the required filtration efficiency and to withstand diesel fuel and its additives. Using a non-genuine filter can compromise the entire fuel system’s integrity.
The following table outlines the key technical parameters for the FOTON Fuel Water Separator Filter, OEM number P558000.
| Parameter | Specification |
|---|---|
| OEM Part Number | P558000 |
| Brand | FOTON |
| Product Name | Fuel Water Separator Filter |
| Cross-Reference | SN1212 |
| Type | Spin-On Cartridge with Collection Bowl |
| Filtration Rating | 2-10 Microns (Particulate) |
| Water Removal Efficiency | >95% of free and emulsified water |
| Sensor | Integrated Water-in-Fuel (WIF) Sensor (Typical) |
| Drain | Manual Drain Valve |
| Primary Application | FOTON Trucks with Common-Rail Diesel Engines |
Selecting the authentic P558000 is a direct investment in your engine’s protection and your operational budget. Genuine FOTON parts are engineered and validated as part of the complete vehicle system. The filtration media in the P558000 is specifically selected to balance high efficiency with optimal flow characteristics for your engine’s fuel pump.
Non-genuine or counterfeit filters may look similar but often use inferior filter paper, have less effective water separation technology, or feature poorly sealing gaskets. These shortcomings can allow water and particles to pass through, leading to injector damage, or cause air leaks that result in hard starting and power loss. The reliability and performance guaranteed by the genuine P558000 far outweigh the minimal upfront cost saving of a substandard alternative.
Q: How often should I drain water from the P558000 separator?
A: Drain water whenever you see a significant amount in the transparent bowl (about 1/4 full) or immediately when the water-in-fuel warning light illuminates on your dashboard. A daily check during pre-trip inspections is recommended.
Q: Can I just replace the filter cartridge, or do I need the whole assembly (P558000)?
A: The P558000 is typically supplied as a complete spin-on cartridge unit, which includes the filter media, bowl, and seals. Some systems may have a separate, reusable bowl, but for most applications, the entire unit is replaced as one part for convenience and guaranteed sealing.
Q: What happens if I ignore the water-in-fuel warning light?
A: If ignored, water will eventually be drawn into the fuel injection system. This can cause immediate engine stalling, corrosion, and catastrophic failure of expensive fuel injectors and high-pressure pumps. The repair cost will be many times the price of a P558000 filter.
Q: My truck doesn’t have a warning light. How do I know when to change the P558000?
A: Follow the manufacturer’s recommended service interval in your manual strictly. Additionally, monitor engine performance. Symptoms like hard starting, loss of power, rough idling, or excessive smoke can indicate a clogged filter. Visually inspect the filter and drain bowl regularly.
Q: Is the P558000 filter the same as a primary fuel filter?
A: Yes, the P558000 typically serves as the primary fuel filter/water separator in the system. Some trucks may have a secondary, finer filter closer to the engine. Always consult your truck’s diagram to understand its specific fuel filtration layout.
The P558000 Fuel Water Separator Filter is a small but profoundly important component in your FOTON truck’s fuel system. Its role in removing both solid contaminants and water is fundamental to achieving reliable engine operation, maximizing fuel economy, and preventing devastatingly expensive repairs. Regular maintenance of this component is not an option; it is a necessity for any professional truck operation.
By consistently choosing the genuine OEM P558000 filter and adhering to a disciplined inspection and replacement schedule, you are protecting your vehicle’s most critical and costly systems. This simple practice ensures your FOTON truck remains a dependable, efficient, and profitable asset for the long haul.
This comprehensive guide has detailed the function, benefits, and maintenance of the FOTON Fuel Water Separator. For optimal protection, always specify the correct part number: P558000.
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