一、 By Installation Location

1. External Fuel Filter

• Suitable for diesel vehicles or those operating in harsh conditions; requires regular inspection (recommended replacement every 20,000–40,000 km).

• Some models integrate a water sensor to alert users for drainage.

• Typically mounted on the fuel line in the chassis or engine bay, easy to replace.

• Metal or plastic housing with high pressure resistance (up to 300 kPa for EFI systems).

• Features:

• Applications:

2. Internal Fuel Filter

• Ideal for gasoline vehicles, especially high-pressure direct-injection engines, to prevent injector blockages.

• Reduces fuel pump wear and stabilizes fuel delivery.

• Located inside the fuel tank, integrated with the fuel pump; requires tank removal for replacement.

• Higher filtration accuracy (e.g., 10 microns) and longer lifespan (60,000–100,000 km).

• Features:

• Applications:

二、 By Fuel Type

1. Diesel Fuel Filter

• Mitigates high sulfur content and moisture in diesel, preventing cold-weather icing and sulfuric acid corrosion.

• China VI standards require ≥ 99% water separation and ≥ 3-micron particle removal.

• Dual-stage (primary/secondary) filtration with some models integrating a water separator.

• Filtration accuracy ≤ 5 microns, using hydrophilic materials for water separation.

• Features:

• Applications:

2. Gasoline Fuel Filter

• Filters gum and additive residues in gasoline to protect injector atomization.

• Prevents fuel pump jamming due to impurities, reducing starting difficulties.

• Filter element made of paper or synthetic fiber, with 10–20-micron accuracy.

• High pressure resistance (≥ 500 kPa) for EFI systems.

• Features:

• Applications:

3. Natural Gas Filter

• Protects valves and injection systems from sulfide corrosion in gaseous fuels.

• Enhances combustion efficiency and reduces carbon buildup.

• Designed for CNG/LPG; filters gaseous contaminants.

• Multi-layer mesh or activated carbon adsorption, with ≥20 MPa pressure resistance.

• Features:

• Applications:

三、 By Filtration Technology

1. Mechanical Filtration

• Principle: Intercepts particles via mesh screens or filter paper.

• Typical Applications: External diesel/gasoline filters.

2. Adsorptive Filtration

• Principle: Uses activated carbon or polymer materials to adsorb moisture and chemical contaminants.

• Typical Applications: Diesel water separators, premium gasoline filters.

3. Centrifugal Separation

• Principle: Separates water and impurities using centrifugal force generated by rotation.

• Typical Applications: Filters for large diesel engines.