Applications:

DYNAPAC  CA 2500 D/PDCA 3500 DCA 4000CC 4000 VICC 4000 VICC 4200 VICC 5200 VICC 6200 VI
HYUNDAI  HX 130 A LCRHX 140A LHX 140 LCHX 145 A-LCR
ISUZU  B 120 - CITIPORT
JLG  SkyTrak 10042SkyTrak 10054SkyTrak 6036SkyTrak 6042SkyTrak 8042
LIUGONG  922 E
MANITOU  MI 45 DMI 50 D
PACCAR  PX-7
ZOOMLION  ZT 58 JZTH 3507 AGZTH 3513ZTH 4014ZTH 4014ZTH 4018ZTH 4018

Professional Fleetguard FF266 Cross Reference Filter WF10590 SP133752 3698447

Q: How often should I replace my fuel water separator filter?

The replacement cycle of the fuel water separator filter is not fixed and needs to be comprehensively judged based on factors such as vehicle usage, fuel quality, and operating environment.

General recommended cycle
• Normal situation: Replace it every 10000 kilometers or so.
• High quality fuel+good environment: can be extended up to 12000-15000 kilometers.
• Poor quality fuel or humid and dusty environment: It is recommended to shorten it to around 8000 kilometers or even shorter.

Other reference basis
• Synchronize with oil filter replacement: Most vehicles change their oil and filter every 8000-10000 kilometers, and it is also recommended to replace the fuel water separation filter at this time.
• Model differences: Some models (such as the Kept N300) require the entire separator to be replaced every 10000-20000 kilometers.

Q: How to empty a fuel water separator?

Emptying the fuel moisture separator is an important maintenance operation for diesel vehicles or diesel engine equipment, aimed at removing the accumulated moisture and impurities at the bottom of the separator, preventing them from entering the fuel system and causing corrosion or poor combustion.
• Park the vehicle on a flat, solid surface and tighten the handbrake.
• Turn off the engine and wait for it to completely cool down to avoid the risk of high-temperature burns or fuel evaporation.

• Most car models have fuel water separators located near the fuel filter on the chassis, while some models may have them in the engine compartment or on the frame side near the fuel tank.
• Slowly loosen the drain bolt or knob (usually a bottom plug or drain valve) to allow the mixture (moisture+a small amount of fuel) to flow into the container.
• Closely observe the state of the flowing liquid: initially it is cloudy and milky white (containing water), and when clear fuel flows out, it indicates that the water has been basically drained.
• Immediately tighten the drain bolt to prevent continuous fuel leakage.
• Subsequent inspection and handling; Check for leaks around the drainage outlet, and if necessary, tighten or replace the seals. Clean up spilled oil stains and keep the work area clean.

Supplementary operations for special vehicle models (some diesel vehicles)

Some diesel models (such as Iveco, Foton, Heavy Duty Truck, etc.) use manual fuel transfer pumps to assist in drainage:
1. Open the engine hood and place a container at the end of the hose below the drain plug of the fuel water separator.
2. Loosen the drain plug counterclockwise and operate the manual fuel transfer pump on the diesel filter about 10 times until the fuel water separator is filled with fuel.
3. Tighten the drain plug clockwise and press the manual pump several times to restore the oil circuit pressure.
4. Start the engine, check if the drain plug is leaking oil, and confirm if the fuel water separator warning light on the dashboard is off.

Precautions
• Regular emissions: It is recommended to conduct emissions every 2000-5000 kilometers or when fuel system abnormalities are detected. Please refer to the vehicle maintenance manual for details.
• Cold weather protection: In low temperature environments, moisture can easily freeze and block pipelines. Consider installing insulation sleeves or using antifreeze fuel additives.

Q: Is a fuel filter the same as a fuel water separator?

The fuel filter and the fuel water separator are not entirely identical concepts, but there is a relationship of inclusion and overlap between them. The specific differences are as follows:

Core relationship

• The fuel filter is a general term referring to devices used to filter impurities and moisture from fuel, including gasoline filters and diesel filters.
• The fuel water separator (commonly referred to as the "fuel water separator") is a type or functional component of the fuel filter, particularly more common in diesel systems, specifically designed to separate water from the fuel.

Functional differences

• Fuel filter:
o Primary function: Filter out solid impurities (such as metal debris, dust) and some moisture from the fuel.
o Extensive application: Used in both gasoline and diesel vehicles, but gasoline filters typically do not emphasize water removal functionality.
• Fuel water separator:
o Primary function: Efficiently separate water (especially emulsified water) from fuel to prevent corrosion and issues such as injector clogging caused by water entering the engine.
o Primarily used in diesel vehicles: Due to diesel's tendency to absorb water and its sensitivity to moisture, fuel water separators are commonly installed in diesel vehicles meeting China's National III and above emission standards as part of the coarse or fine filtration system.```.

Structure and Working Mechanism

• Fuel filter (especially diesel fine filter):
Mostly adopts microporous paper filter elements, which physically intercept and adsorb impurities, with some featuring hydrophobic oleophobic layers to assist in water removal.
• Fuel water separator:
By utilizing principles such as gravitational settling, coalescence, and demulsification, water droplets are condensed and discharged into a collection cup, requiring periodic manual or automatic drainage.

Relationships in practical applications

• In modern diesel fuel systems, a two-stage filtration process is commonly employed:
Level 1: Fuel water separator (coarse filter) → Prioritize water removal and intercept large particles.
2. Second Level: Diesel Fine Filter → Further filters out tiny impurities to ensure the cleanliness of the fuel injection system.
Therefore, the fuel water separator can be regarded as a functional subunit within the fuel filtration system, rather than a completely independent device.

Summary

• They are not the same thing, but the fuel water separator is a special type of fuel filter.
Gasoline vehicles typically require only a standard fuel filter (water removal is not a primary function);
• Diesel vehicles (especially commercial ones) are strongly recommended to be equipped with dedicated fuel water separators to enhance engine reliability.