Fleetguard | 2007.5-2009 Dodge Ram 6.7L Cummins FS-2 Fuel Filter

Fleetguard FS43258 Filter-in-Filter™ Fuel Filter | 2007.5–2009 Dodge Ram 6.7L Cummins

Description

Your common rail fuel system depends on exceptionally clean fuel to deliver the performance and reliability the 6.7L Cummins is known for.

The injectors and high-pressure fuel system operate with extremely tight tolerances, meaning even microscopic contaminants or water can cause premature wear, reduced fuel pressure, poor injector performance, and expensive repairs.

The Fleetguard FS43258 Filter-in-Filter™ Fuel Cartridge is the genuine replacement fuel filter for 2007.5–2009 Dodge Ram 6.7L Cummins trucks equipped with the upgraded reusable filter housing. Featuring Fleetguard's innovative Filter-in-Filter™ technology, the FS43258 combines two stages of filtration into a single replaceable cartridge, providing outstanding contaminant removal and water separation without increasing service complexity. It filters to 5 microns at 98.7% efficiency, has an 18-gram contaminant holding capacity, and supports a maximum flow rate of 67.26 GPH.

Designed by Fleetguard—the filtration company trusted by Cummins—the FS43258 helps protect one of the most expensive systems on your truck.

Features

• Genuine Fleetguard FS43258 fuel filter cartridge
• Advanced Filter-in-Filter™ dual-stage filtration
• 5-micron filtration at 98.7% efficiency
• Excellent free and emulsified water separation
• 18-gram contaminant holding capacity
• Maximum flow rate of 67.26 GPH
• Cartridge-only replacement for reusable filter housing
• Includes new O-ring
• OEM-quality construction
• Direct replacement for upgraded 2007.5–2009 filter housings

What Is Filter-in-Filter™ Technology?

Fleetguard developed Filter-in-Filter™ technology to improve filtration without requiring additional filters or plumbing.

Inside the cartridge are two filtration stages working together:

• The outer filter removes larger contaminants and separates water.
• The inner filter captures finer particles before they reach the high-pressure injection system.

This design delivers:

• Improved injector protection
• Better water separation
• Excellent fuel flow
• Longer filter service life
• Easy maintenance with only the cartridge needing replacement during service

Glacier Tech Tip

Many diesel owners think fuel filters are only there to remove dirt.

In reality, one of their most important jobs is water separation.

Diesel fuel naturally attracts moisture. If water reaches your injectors or high-pressure fuel components, it reduces lubrication, promotes corrosion, and accelerates wear inside precision-machined parts.

Replacing your fuel filter on schedule helps remove both contaminants and water before they become expensive problems.

Why Choose Genuine Fleetguard?

Fleetguard engineers its filtration products specifically for Cummins engines.

Unlike many aftermarket filters, the FS43258 is designed to provide the proper balance of:

• High filtration efficiency
• Excellent water separation
• Low restriction
• Proper sealing
• Long service life

Because it was engineered alongside the Cummins fuel system, you can trust it to provide the protection your engine was designed to have.

Applications

Fits:

• 2007.5 Dodge Ram 2500 6.7L Cummins
• 2007.5 Dodge Ram 3500 6.7L Cummins
• 2008 Dodge Ram 2500 6.7L Cummins
• 2008 Dodge Ram 3500 6.7L Cummins
• 2008 Dodge Ram 4500 6.7L Cummins
• 2008 Dodge Ram 5500 6.7L Cummins
• 2009 Dodge Ram 2500 6.7L Cummins
• 2009 Dodge Ram 3500 6.7L Cummins
• 2009 Dodge Ram 4500 6.7L Cummins
• 2009 Dodge Ram 5500 6.7L Cummins

Cross Reference

Replaces service cartridge for the Fleetguard FS43257 reusable filter assembly.

Important Notes

• Genuine Fleetguard FS43258 replacement cartridge.
• Fits trucks equipped with the upgraded reusable Filter-in-Filter™ housing (FS43257).
• Includes a new canister O-ring.
• Properly lubricate the new O-ring before installation.
• Prime the fuel system according to Cummins procedures after replacing the filter.
• Replace according to Cummins' recommended maintenance intervals.

Common Failure Point

One of the leading causes of injector and high-pressure fuel pump wear is contaminated fuel.

Microscopic particles and water gradually erode precision-machined components long before any drivability symptoms appear. By the time rough running or low fuel pressure develops, significant wear may have already occurred.

Routine replacement of the FS43258 helps ensure clean, dry fuel reaches your injection system, protecting thousands of dollars in fuel system components.

Complete Your Cummins Maintenance

Keep your 6.7L Cummins protected with genuine Fleetguard maintenance products:

• Fleetguard LF16035 Stratapore® Engine Oil Filter
• Fleetguard AF27684 Engine Air Filter
• Fleetguard CV52001 CCV Filter
• Glacier Diesel Power Fuel Pressure Test Kits
• Glacier Diesel Power Fuel Pressure Test Fittings
• Glacier Diesel Power Fuel System Diagnostic Tools
• Glacier Diesel Power Fuel System Components

Routine maintenance with genuine Fleetguard filtration is one of the most effective ways to maximize injector life, protect your high-pressure fuel system, and keep your 6.7L Cummins running reliably for years to come.