GREND Fuel Water Separator Filter Element FS20081 for Cummins ISB/ISL (2017–2021) — High-Efficiency Water Separation, Direct-Fit

GREND FS20081 is a direct-fit fuel water separator filter element designed to trap water and fine contaminants, protecting 2017–2021 Cummins ISB/ISL and many International/Detroit diesel engines.

If you operate medium- and heavy-duty trucks or buses with Cummins ISB/ISL or compatible Detroit engines, a reliable fuel water separator is critical to keep fuel dry and filtration efficient. The GREND FS20081 replaces OEM references A0000904851, PF46171 and L20081 and is built with high-efficiency media to remove water and smaller particulates that accelerate wear and cause poor combustion.

How does the GREND FS20081 protect my engine from fuel contamination?

The FS20081 combines a water-separating chamber with fine filtration media to reduce water and microscopic debris in the fuel stream. Cleaner fuel lowers injector wear and maintains consistent fuel delivery under varied operating conditions.

• High-efficiency filter media captures finer particles than basic filters.
• Integrated water separation reduces corrosion and injector fouling.
• Stable flow characteristics help preserve pump and injector performance.

Which vehicles and engines is this element compatible with?

This element fits a broad range of Cummins, International and Detroit diesel platforms from model years cited by OEM cross-references. It’s suitable as a replacement for several manufacturer part numbers, simplifying maintenance across mixed fleets.

• Replaces OEM A0000904851, PF46171, L20081 and listed cross-references.
• Compatible with 2017–2021 Cummins ISB and ISL applications and DD5/DD8 engines.
• Used in International Trucks (Durastar, Workstar, MV607, 4300, M2 series), Freightliner/other chassis listed.

How easy is installation and routine service with the FS20081?

GREND designs the FS20081 as a drop-in replacement—installation follows the OEM’s filter change procedure with no special tools required. Each filter is inspected before shipment to ensure reliable fit and function.

• Direct-fit design requires standard filter change steps—no modifications.
• Pre-shipment quality checks minimize risk of defects on arrival.
• Sold individually; replace according to vehicle maintenance interval recommendations.

What performance features should I expect from this fuel/water separator?

The FS20081 emphasizes contaminant capture and water removal while maintaining flow stability. These attributes contribute to extended component life and steadier engine operation under real-world duty cycles.

• Fine filtration media captures smaller particulates to reduce mechanical wear.
• Effective water separation helps prevent injector and pump damage.
• Durable construction for consistent performance across service intervals.

Who this product is for: fleet managers, owner-operators and maintenance technicians who service 2016–2021 medium- and heavy-duty trucks, buses and vocational vehicles powered by Cummins ISB/ISL or compatible Detroit engines. If you need a cost-effective, OEM-referenced replacement to remove water and fine fuel contaminants, the GREND FS20081 is engineered to match fitment and filtration expectations for mixed fleets and single-vehicle owners alike.

• Package contents: 1 x FS20081 fuel filter water separator.
• Quality: factory inspection before shipping; designed for easy installation and reliable operation.
• Note: follow your vehicle manufacturer’s service intervals and procedures when replacing filters.