Genuine Sinotruk HOWO Fuel Water Separator Filter VG1092080052 / PL421

The VG1092080052 (PL421) is a high-efficiency primary fuel filter designed specifically for Sinotruk HOWO trucks equipped with common-rail fuel systems. Its primary role is to act as a first-stage water separator, protecting the expensive high-pressure injectors from water-induced erosion and microbial growth. As a frequently replaced Sinotruk spare part, this filter is engineered to maintain low pressure drop even as it captures micron-level contaminants, ensuring your engine gets the clean fuel flow it needs during heavy-haul operations.

Technical Specifications:

• Part Number: VG1092080052

• Standard Reference: PL421 (Compatible with PL420 series housings)

• Filtration Efficiency: 98.5% at 10 microns

• Primary Function: Fuel/Water Separation

• Applicable Models: Sinotruk HOWO, HOWO A7, T7H, TX with WD615 or D12 engines.

• Housing Material: Corrosion-resistant treated steel

• Gasket Type: High-temp Nitrile Rubber

• Drain Valve: Integrated manual drain at the bottom

Pro-Tips for Replacing your VG1092080052 Filter:

1. Drain Before Removal: Before unscrewing the old filter, use the bottom valve to drain the accumulated water into a container. This prevents diesel from spilling onto your engine belts.

2. Inspect the Water Bowl: The PL421 often attaches to a transparent collection bowl. Check the bowl for cracks or sediment buildup; if it’s clouded, clean it with fresh diesel (never use brake cleaner as it can embrittle the plastic).

3. The “Pre-Fill” Debate: While some mechanics install filters dry to ensure the fuel is filtered before hitting the pump, on Sinotruk D12 engines, it’s often safer to pre-fill the filter with clean diesel to minimize air in the lines, then use the hand primer.

4. Seal Lubrication: Never install the filter with a dry gasket. Lightly coat the top rubber ring with clean engine oil or fuel to ensure it doesn’t “bunch up” when tightened.

5. Torque by Hand: Spin the filter until the gasket touches the base, then tighten by hand exactly 3/4 to 1 full turn. Over-tightening with a tool will make the next service nearly impossible and may damage the filter head.