Fleetguard FS43257 Filter-in-Filter™ Fuel Filter Assembly | 2007.5–2009 Dodge Ram 6.7L Cummins Upgrade
Description
If you own a 2007.5–2009 Ram 6.7L Cummins, upgrading your factory fuel filter assembly is one of the best ways to improve fuel filtration while reducing long-term maintenance costs.
The Fleetguard FS43257 Filter-in-Filter™ Fuel Filter Assembly replaces the original FS43252 single-stage filter assembly with Fleetguard's innovative FS² (Filter-in-Filter™) technology. Instead of replacing the entire filter assembly during every service, the FS43257 uses a durable reusable composite housing. Future maintenance requires replacing only the FS43258 internal filter cartridge and O-ring, reducing waste and lowering service costs.
Designed by Fleetguard—Cummins' official filtration company—the FS43257 provides dual-stage filtration, excellent water separation, and OEM-quality protection for your high-pressure common rail fuel system.
Features
- Genuine Fleetguard FS43257 fuel filter assembly
- Upgrades earlier FS43252 single-stage filter
- Advanced FS² (Filter-in-Filter™) dual-stage filtration
- Reusable composite filter housing
- Replace only the internal FS43258 cartridge during future services
- Includes water-in-fuel (WIF) sensor provision
- Includes reusable drain valve
- 5-micron filtration at 98.7% efficiency
- 18-gram contaminant holding capacity
- Maximum fuel flow of 67.26 GPH
- Direct bolt-in replacement for applicable 2007.5–2009 trucks
Why Upgrade to the FS43257?
The original fuel filter assembly used on early 6.7L Cummins trucks relied on a traditional single-stage filter.
Fleetguard developed the FS43257 to improve filtration performance while making future maintenance easier.
Benefits include:
- Better contaminant removal
- Improved water separation
- Longer injector life
- Lower long-term maintenance costs
- Reduced waste by reusing the filter shell
Once this assembly is installed, routine fuel filter service only requires replacing the Fleetguard FS43258 filter cartridge, not the complete housing.
Glacier Tech Tip
Many owners mistakenly purchase a complete filter assembly every time they perform fuel filter maintenance.
After installing the FS43257 once, future service only requires replacing the internal FS43258 cartridge kit, which includes a new filter element and sealing O-ring.
This saves money while keeping the original composite housing, drain valve, and water-in-fuel sensor in service.
Why Choose Fleetguard?
Fleetguard engineers the filtration systems used by Cummins to protect some of the most demanding diesel fuel systems on the road.
The FS43257 was designed specifically to provide:
- High-efficiency contaminant removal
- Excellent water separation
- Low fuel restriction
- OEM-quality sealing
- Long service life
- Simplified maintenance
Because it was developed alongside the Cummins fuel system, you can be confident it delivers the performance 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
| Fleetguard | Cummins | Mopar |
|---|---|---|
| FS43257 | 5257769 | 68061633AA |
Replaces:
- Fleetguard FS43252
- Cummins 4936025
- Mopar 05183410AA
Important Notes
- Complete fuel filter assembly with reusable housing.
- Future maintenance uses the Fleetguard FS43258 replacement cartridge.
- Includes reusable composite canister, drain valve, and water-in-fuel sensor provision.
- Lubricate the new O-ring during every filter service.
- Always prime the fuel system before starting the engine after replacing the filter.
- Replace the internal cartridge at the recommended Cummins service interval.
Common Failure Point
One of the biggest threats to a common rail diesel fuel system is contamination that isn't visible to the naked eye.
Microscopic dirt particles and water slowly wear injector nozzles, fuel control components, and the high-pressure injection pump. The damage is gradual, often occurring long before noticeable drivability problems develop.
The dual-stage FS43257 filtration system helps remove contaminants before they reach these precision components, providing an extra layer of protection for one of the most expensive systems on your truck.
Complete Your Cummins Maintenance
Protect your fuel system with genuine Fleetguard and Glacier Diesel Power products:
- Fleetguard FS43258 Replacement Filter Cartridge
- Fleetguard LF16035 Stratapore® 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
Upgrading to the FS43257 gives your 2007.5–2009 Cummins a modern, reusable filtration system that provides OEM-quality protection today while making future fuel filter maintenance faster, cleaner, and more economical.
Fleetguard FS43257 Filter-in-Filter™ Fuel Filter Assembly | 2007.5–2009 Dodge Ram 6.7L Cummins Upgrade
Description
If you own a 2007.5–2009 Ram 6.7L Cummins, upgrading your factory fuel filter assembly is one of the best ways to improve fuel filtration while reducing long-term maintenance costs.
The Fleetguard FS43257 Filter-in-Filter™ Fuel Filter Assembly replaces the original FS43252 single-stage filter assembly with Fleetguard's innovative FS² (Filter-in-Filter™) technology. Instead of replacing the entire filter assembly during every service, the FS43257 uses a durable reusable composite housing. Future maintenance requires replacing only the FS43258 internal filter cartridge and O-ring, reducing waste and lowering service costs.
Designed by Fleetguard—Cummins' official filtration company—the FS43257 provides dual-stage filtration, excellent water separation, and OEM-quality protection for your high-pressure common rail fuel system.
Features
- Genuine Fleetguard FS43257 fuel filter assembly
- Upgrades earlier FS43252 single-stage filter
- Advanced FS² (Filter-in-Filter™) dual-stage filtration
- Reusable composite filter housing
- Replace only the internal FS43258 cartridge during future services
- Includes water-in-fuel (WIF) sensor provision
- Includes reusable drain valve
- 5-micron filtration at 98.7% efficiency
- 18-gram contaminant holding capacity
- Maximum fuel flow of 67.26 GPH
- Direct bolt-in replacement for applicable 2007.5–2009 trucks
Why Upgrade to the FS43257?
The original fuel filter assembly used on early 6.7L Cummins trucks relied on a traditional single-stage filter.
Fleetguard developed the FS43257 to improve filtration performance while making future maintenance easier.
Benefits include:
- Better contaminant removal
- Improved water separation
- Longer injector life
- Lower long-term maintenance costs
- Reduced waste by reusing the filter shell
Once this assembly is installed, routine fuel filter service only requires replacing the Fleetguard FS43258 filter cartridge, not the complete housing.
Glacier Tech Tip
Many owners mistakenly purchase a complete filter assembly every time they perform fuel filter maintenance.
After installing the FS43257 once, future service only requires replacing the internal FS43258 cartridge kit, which includes a new filter element and sealing O-ring.
This saves money while keeping the original composite housing, drain valve, and water-in-fuel sensor in service.
Why Choose Fleetguard?
Fleetguard engineers the filtration systems used by Cummins to protect some of the most demanding diesel fuel systems on the road.
The FS43257 was designed specifically to provide:
- High-efficiency contaminant removal
- Excellent water separation
- Low fuel restriction
- OEM-quality sealing
- Long service life
- Simplified maintenance
Because it was developed alongside the Cummins fuel system, you can be confident it delivers the performance 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
| Fleetguard | Cummins | Mopar |
|---|---|---|
| FS43257 | 5257769 | 68061633AA |
Replaces:
- Fleetguard FS43252
- Cummins 4936025
- Mopar 05183410AA
Important Notes
- Complete fuel filter assembly with reusable housing.
- Future maintenance uses the Fleetguard FS43258 replacement cartridge.
- Includes reusable composite canister, drain valve, and water-in-fuel sensor provision.
- Lubricate the new O-ring during every filter service.
- Always prime the fuel system before starting the engine after replacing the filter.
- Replace the internal cartridge at the recommended Cummins service interval.
Common Failure Point
One of the biggest threats to a common rail diesel fuel system is contamination that isn't visible to the naked eye.
Microscopic dirt particles and water slowly wear injector nozzles, fuel control components, and the high-pressure injection pump. The damage is gradual, often occurring long before noticeable drivability problems develop.
The dual-stage FS43257 filtration system helps remove contaminants before they reach these precision components, providing an extra layer of protection for one of the most expensive systems on your truck.
Complete Your Cummins Maintenance
Protect your fuel system with genuine Fleetguard and Glacier Diesel Power products:
- Fleetguard FS43258 Replacement Filter Cartridge
- Fleetguard LF16035 Stratapore® 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
Upgrading to the FS43257 gives your 2007.5–2009 Cummins a modern, reusable filtration system that provides OEM-quality protection today while making future fuel filter maintenance faster, cleaner, and more economical.