Fuel filters
The diesel fuel filter protects the injection system from solid particles and water present in diesel fuel. Modern common-rail injectors operate with tolerances of 1–3 µm at pressures exceeding 2,000 bar — even small amounts of contamination can cause costly damage. Fuel filters with built-in water separators additionally remove moisture that corrodes pump components and injector nozzles.
We supply inline fuel filters, spin-on filters with drain bowls and cartridge elements for trucks, construction machines, agricultural equipment and generator sets. Manufacturers available at Filtry.org — HIFI Filter, SF Filter, PZL Sędziszów — cover applications from compact Kubota engines to large-displacement Caterpillar and Cummins units.
Frequently asked questions
Why must a diesel fuel filter separate water?
Water in diesel fuel corrodes the precision components of the high-pressure pump and injectors. Even 200 ppm of water can halve injector service life. The water separator traps emulsified and free water, which is then drained through a valve at the bottom of the filter bowl.
How often should the fuel filter be replaced?
In heavy-duty vehicles every 30,000–60,000 km; in construction machines every 500–1,000 engine hours. Check the filter more frequently in winter, when condensation in the fuel tank increases, and after refuelling from unknown sources.
What does the fuel filter contamination indicator mean?
Many diesel fuel filters feature a differential-pressure sensor or a sight glass that shows how clogged the element is. When the service light comes on or the gauge reaches the red zone, the filter is nearing the end of its service life and should be replaced.
Do diesel fuel filters fit petrol engines?
No — diesel filters have a different construction (water separator, higher working pressures) and different fittings. Petrol engines use separate filters with smaller capacity and a different filtration rating.