Cummins Filtration FS20378 Fleetguard Fuel Water Separator Cartridge Filter

The Cummins Filtration Fleetguard FS20378 is a high-efficiency fuel water separator cartridge filter designed for diesel applications requiring premium fuel system protection. This cartridge serves as a critical first line of defense in multi-stage diesel fuel filtration systems, removing water and fine particulates before fuel reaches downstream components.

Engineered to approximately 2-micron filtration efficiency, the FS20378 utilizes a multi-layer filter construction to protect sensitive high-pressure common rail fuel system components — including injectors and high-pressure fuel pumps — from damaging contaminants and water intrusion. The filter is chassis-mounted, positioning it early in the fuel flow path for maximum upstream protection.

Key Features:

• ~2 Micron High-Efficiency Filtration — Captures fine fuel contaminants and protects high-pressure fuel system components
• Water Separation — Effectively separates water from diesel fuel to prevent corrosion and injector damage
• Multi-Layer Filter Media — Advanced construction for superior filtration performance and longer service life
• Chassis-Mounted Design — Mounts under the bed/frame rail for accessible servicing
• OEM-Quality Replacement — Replaces Mopar OEM part number 68436631AA
• Genuine Fleetguard / Cummins Filtration — Manufactured by the world leader in OEM and aftermarket diesel filtration

Routine replacement of the FS20378 is essential for maintaining fuel system health, particularly for vehicles operating in demanding conditions such as heavy towing, dusty environments, or areas with variable fuel quality. For complete fuel system maintenance, this filter should be serviced together with the complementary front fuel filter.