What does P551864 fit?

NEW HOLLAND  E 135 BE 150 B SRE 265 SR
SANY  SY 50 U
SHANTUI  SL 50 W-3
TEREX  3066 CTR 35
VOLKSWAGEN  23.21023.21023.22023.250 E23.31026.22026.26026.30031.310TITAN 26.310

Professional Fuel Filter Interchange P551864 P553201 P502516 P502472 P505961

Q: How often do I need to change my fuel water separator?

The replacement cycle of fuel water separators is not fixed and needs to be comprehensively judged based on factors such as fuel quality, usage environment, vehicle type, and driving frequency.

Generally recommended replacement cycle

• Normal situation: Replace every 10000 kilometers or so.
• Partial diesel models: It is recommended to replace them every 20000 kilometers or 1 year, whichever is earlier.

Key factors affecting replacement cycle

• Fuel quality:
Using high-quality fuel (with low impurities and moisture): can be extended up to 12000 to 15000 kilometers.
Using low-quality or high water content fuel: It is recommended to shorten it to 8000 kilometers or even shorter.
• Operating environment:
In humid areas (such as coastal areas), it is recommended to replace it after about 9000 kilometers.
In areas with high levels of dust or sandstorms, it is recommended to replace it after approximately 8500 kilometers.
• Vehicle usage frequency and intensity:
High frequency use of taxis, ride hailing services, etc.: It is recommended to replace them after 8000-10000 kilometers.
Low frequency use of private cars: Even if the mileage is not reached, it is recommended to check at least once a year and replace it if necessary.

Determine whether the signal needs to be replaced in advance

The dashboard displays a water in fuel warning light (usually a cone+water droplet icon).
The engine experiences difficulty starting, decreased power, idle shaking, or stalling.
During each maintenance, manually check the status of the filter element. If there is obvious blockage, deformation, or severe water accumulation, it should be replaced immediately.

Q: What are the signs of a bad fuel filter?

When the fuel filter is damaged or clogged, the vehicle will exhibit a series of typical symptoms.
1、 Abnormal power and driving performance
• Weak acceleration: When accelerating rapidly or under heavy loads (such as full load or climbing), the power significantly decreases, and the response to stepping on the accelerator is slow.
• Driving fatigue: Difficulty in increasing speed, feeling "lackluster" when driving at high speeds.
• Sagging (jerking): There is a noticeable forward movement or jerking sensation during acceleration, especially during moderate congestion.

2、 Start and idle issues
• Difficulty starting: Multiple ignitions are required to start the car when it is cold or hot, and in severe cases, it cannot be started.
• Idle shaking: The engine speed is unstable when idling, and the steering wheel or body shakes noticeably.
• Easy to stall: Sudden stall during driving (especially when shifting gears or turning at low speeds) or idling.
3、 Changes in fuel consumption and emissions
• Increased fuel consumption: Fuel consumption per 100 kilometers may increase by 10% -20% due to ECU compensation for insufficient fuel supply.
• Abnormal exhaust: The exhaust has a pungent odor or emits black smoke, indicating insufficient combustion.

4、 System alarm and abnormal noise
• Fault light on: Check Engine may light up; Some car models also have the fuel filter warning light on.
• Oil pump abnormal noise: The working noise of the fuel pump increases, and the load increases due to blockage.
5、 Abnormal fuel condition (visible during disassembly inspection)
Remove the filter and release the fuel. If the color turns black, there are obvious impurities or moisture, it indicates that the filter element has failed.

Q: Can you run without a fuel filter?

Without a fuel filter, theoretically the vehicle can run for a short period of time, but long-term use can seriously damage the engine and fuel system.
In the short term, some vehicles (especially those with National VI and above emission standards) may still be able to start and drive without a fuel filter due to the primary filtering function of the fuel pump or injector.
But not recommended: Even if it can run, impurities can directly enter the fuel system, causing problems such as clogged fuel injectors, worn fuel pumps, and decreased power.