Glacier Diesel Power 2007.5–2009 Dodge Ram 6.7L Cummins Big Line Kit (07509BLK)
Description
The factory fuel line between the fuel filter housing and CP3 injection pump is one of the smallest sections of the fuel supply system on the 2007.5–2009 6.7L Cummins.
Although the factory in-tank lift pump may be capable of supplying the engine, fuel leaving the filter housing must still pass through a small pressed-on nylon line and restrictive fittings before reaching the CP3. This becomes especially important when upgrading the lift pump or increasing the engine’s fuel demand.
The Glacier Diesel Power Big Line Kit replaces that restrictive factory assembly with custom stainless-steel adapters, full-size 3/8-inch Push-Lok fuel hose, quality fittings, and the required clamps. This creates a larger, serviceable fuel path from the factory filter housing to the CP3 injection pump.
The original fittings measure approximately 0.185 inch through their internal passage, while Glacier’s stainless-steel fittings measure approximately 0.300 inch. That provides roughly 2.6 times the internal flow area through the fittings, helping eliminate one of the most restrictive sections of the factory supply system.
Whether your truck is stock, equipped with an upgraded lift pump, or used for towing and performance, the Glacier Big Line Kit provides a straightforward way to improve the fuel supply path without replacing the factory filter housing.
Features
- Fits 2007.5–2009 Dodge Ram trucks with the 6.7L Cummins
- Replaces the factory line between the fuel filter housing and CP3
- Full-size 3/8-inch fuel hose
- Custom Glacier stainless-steel adapters
- Heavy-duty Push-Lok fittings
- Hose clamps included
- Replaces the factory pressed-on nylon fuel line
- Retains the factory fuel filter housing
- Serviceable hose-and-fitting design
- Excellent companion upgrade for an aftermarket lift pump
- Designed to reduce restriction before the injection pump
Why Upgrade the Factory Fuel Line?
A fuel supply system can only flow as effectively as its most restrictive section.
Installing a larger or higher-output lift pump does not remove the small factory line between the filter housing and CP3. Fuel must still pass through that original restriction before reaching the high-pressure injection pump.
The Glacier Big Line Kit replaces both the undersized line and its small factory fittings. This is important because installing a larger hose while retaining restrictive connection points would leave much of the original bottleneck in place.
By opening the complete section from the filter housing to the CP3, the kit allows the lift pump to supply fuel through a larger and more direct path.
The benefit will depend on the condition and configuration of the complete fuel system. A healthy stock truck may respond differently than a modified truck with a higher-output lift pump, additional filtration, or greater fuel demand. For that reason, Glacier focuses on removing the known restriction rather than promising a specific pressure increase on every truck.
Glacier Fuel System Tech Tip
A larger fuel line does not create pressure by itself.
Fuel pressure is produced by the lift pump and affected by the condition of the filters, tank pickup, hoses, fittings, electrical supply, and the engine’s fuel demand. The purpose of the Big Line Kit is to reduce pressure loss through a restrictive portion of the supply system.
When diagnosing low fuel pressure, test the system under load—not only at idle. A truck may show acceptable pressure in the shop but experience a greater pressure drop during acceleration, towing, or sustained engine load.
Installing a properly located fuel-pressure gauge or test fitting can help determine whether the lift pump is maintaining adequate supply pressure at the CP3 inlet.
Why Glacier Built It This Way
We did not want to replace the factory nylon line while leaving the same restrictive fittings in place.
Glacier developed custom stainless-steel adapters that increase the internal passage through the connection points and transition directly into full-size 3/8-inch Push-Lok plumbing. This addresses the entire restrictive section rather than simply replacing the visible hose.
Stainless steel provides excellent strength, corrosion resistance, and long-term durability in diesel fuel applications. It also allows the adapters to maintain precise sealing surfaces where they connect to the factory filter housing and CP3.
Push-Lok hose and fittings were selected because they provide a secure, dependable connection while keeping the system serviceable. Unlike the factory pressed-on nylon assembly, the Glacier line can be inspected, removed, and serviced using conventional tools.
The system is intentionally simple: quality adapters, properly sized hose, dependable fittings, and no unnecessary complexity.
Increased Flow Area Through the Fittings
The factory fittings have an internal diameter of approximately 0.185 inch. Glacier’s stainless-steel fittings increase that passage to approximately 0.300 inch.
Because flow area is based on the square of the radius, the improvement is considerably greater than the diameter comparison alone suggests. The 0.300-inch opening provides approximately 2.6 times the cross-sectional area of the 0.185-inch factory passage.
That does not mean the truck will automatically flow 2.6 times more fuel. Actual fuel delivery remains dependent on the lift pump, filters, plumbing, pressure regulation, and demand. It does mean the Glacier fitting presents substantially more available passage area and removes a known restriction from the system.
Applications and Fitment
Designed for:
- 2007.5 Dodge Ram 6.7L Cummins
- 2008 Dodge Ram 6.7L Cummins
- 2009 Dodge Ram 6.7L Cummins
This kit is intended for trucks retaining the factory-style fuel filter housing and CP3 injection pump.
Kit Contents
The Glacier Diesel Power 2007.5–2009 6.7L Cummins Big Line Kit includes:
- Custom Glacier stainless-steel filter housing adapter
- Custom Glacier stainless-steel CP3 adapter
- Push-Lok fuel fittings
- Full-size 3/8-inch fuel hose
- Required hose clamps
Important Notes
- Replaces the fuel line between the factory filter housing and CP3 only.
- Does not replace the complete fuel supply system from the tank forward.
- Designed for trucks retaining the factory fuel filter housing.
- Compatible with the factory lift pump and many aftermarket lift-pump configurations.
- A properly functioning lift pump is still required.
- Will not correct a failed lift pump, plugged fuel filter, restricted tank pickup, or unrelated fuel-system fault.
- Actual fuel-pressure changes vary based on the complete system.
- Fuel-pressure gauge and sender are not included.
- Route the hose away from exhaust components, sharp edges, and moving parts.
- Inspect all connections for leakage after installation and again after the first complete heat cycle.
- Verify vehicle configuration and fitment before ordering.
Common Failure Point
The pressed-on nylon line and small factory fittings may remain functional for many years, but they still represent one of the narrowest portions of the fuel supply path.
As these trucks age, the original line is also exposed to repeated heat cycles, vibration, engine movement, and diesel fuel. The pressed-on construction makes it less convenient to service than a conventional hose-and-fitting assembly.
Replacing this section removes the restrictive factory plumbing and provides a fresh, serviceable connection between the filter housing and CP3.
However, the Big Line Kit should not be treated as a substitute for complete fuel-system diagnosis. A weak lift pump, plugged filter, damaged tank module, voltage loss, or restriction elsewhere can still cause inadequate fuel delivery.
Installation Overview
Installation requires removing the original pressed-on nylon fuel line between the factory fuel filter housing and CP3 injection pump.
The Glacier stainless-steel adapters are installed at the factory connection points, and the supplied 3/8-inch hose is routed between them using the Push-Lok fittings and clamps.
Keep all open fuel-system connections capped during installation. Dirt or debris introduced while the system is open can travel toward the CP3 and injectors.
After installation:
- Prime the fuel system using the appropriate procedure.
- Pressurize the system before starting the engine.
- Inspect every connection carefully for leakage.
- Start the engine and verify proper operation.
- Recheck the hose routing and connections after the engine reaches operating temperature.
- Inspect the system again after the first complete heat cycle.
Complete Your Fuel System
Complete your Glacier Diesel Power fuel system with:
- Glacier Fuel Boss Mechanical Lift Pump
- Glacier Raptor Pump System
- Glacier Twin Fuel Filter System
- Glacier Severe Service Twin Fuel Filter System
- Fuel-pressure gauge and sender
- Fuel-pressure test fittings
- Replacement Fleetguard fuel filters
- Glacier stainless-steel fuel system adapters
Glacier Diesel Power 2007.5–2009 Dodge Ram 6.7L Cummins Big Line Kit (07509BLK)
Description
The factory fuel line between the fuel filter housing and CP3 injection pump is one of the smallest sections of the fuel supply system on the 2007.5–2009 6.7L Cummins.
Although the factory in-tank lift pump may be capable of supplying the engine, fuel leaving the filter housing must still pass through a small pressed-on nylon line and restrictive fittings before reaching the CP3. This becomes especially important when upgrading the lift pump or increasing the engine’s fuel demand.
The Glacier Diesel Power Big Line Kit replaces that restrictive factory assembly with custom stainless-steel adapters, full-size 3/8-inch Push-Lok fuel hose, quality fittings, and the required clamps. This creates a larger, serviceable fuel path from the factory filter housing to the CP3 injection pump.
The original fittings measure approximately 0.185 inch through their internal passage, while Glacier’s stainless-steel fittings measure approximately 0.300 inch. That provides roughly 2.6 times the internal flow area through the fittings, helping eliminate one of the most restrictive sections of the factory supply system.
Whether your truck is stock, equipped with an upgraded lift pump, or used for towing and performance, the Glacier Big Line Kit provides a straightforward way to improve the fuel supply path without replacing the factory filter housing.
Features
- Fits 2007.5–2009 Dodge Ram trucks with the 6.7L Cummins
- Replaces the factory line between the fuel filter housing and CP3
- Full-size 3/8-inch fuel hose
- Custom Glacier stainless-steel adapters
- Heavy-duty Push-Lok fittings
- Hose clamps included
- Replaces the factory pressed-on nylon fuel line
- Retains the factory fuel filter housing
- Serviceable hose-and-fitting design
- Excellent companion upgrade for an aftermarket lift pump
- Designed to reduce restriction before the injection pump
Why Upgrade the Factory Fuel Line?
A fuel supply system can only flow as effectively as its most restrictive section.
Installing a larger or higher-output lift pump does not remove the small factory line between the filter housing and CP3. Fuel must still pass through that original restriction before reaching the high-pressure injection pump.
The Glacier Big Line Kit replaces both the undersized line and its small factory fittings. This is important because installing a larger hose while retaining restrictive connection points would leave much of the original bottleneck in place.
By opening the complete section from the filter housing to the CP3, the kit allows the lift pump to supply fuel through a larger and more direct path.
The benefit will depend on the condition and configuration of the complete fuel system. A healthy stock truck may respond differently than a modified truck with a higher-output lift pump, additional filtration, or greater fuel demand. For that reason, Glacier focuses on removing the known restriction rather than promising a specific pressure increase on every truck.
Glacier Fuel System Tech Tip
A larger fuel line does not create pressure by itself.
Fuel pressure is produced by the lift pump and affected by the condition of the filters, tank pickup, hoses, fittings, electrical supply, and the engine’s fuel demand. The purpose of the Big Line Kit is to reduce pressure loss through a restrictive portion of the supply system.
When diagnosing low fuel pressure, test the system under load—not only at idle. A truck may show acceptable pressure in the shop but experience a greater pressure drop during acceleration, towing, or sustained engine load.
Installing a properly located fuel-pressure gauge or test fitting can help determine whether the lift pump is maintaining adequate supply pressure at the CP3 inlet.
Why Glacier Built It This Way
We did not want to replace the factory nylon line while leaving the same restrictive fittings in place.
Glacier developed custom stainless-steel adapters that increase the internal passage through the connection points and transition directly into full-size 3/8-inch Push-Lok plumbing. This addresses the entire restrictive section rather than simply replacing the visible hose.
Stainless steel provides excellent strength, corrosion resistance, and long-term durability in diesel fuel applications. It also allows the adapters to maintain precise sealing surfaces where they connect to the factory filter housing and CP3.
Push-Lok hose and fittings were selected because they provide a secure, dependable connection while keeping the system serviceable. Unlike the factory pressed-on nylon assembly, the Glacier line can be inspected, removed, and serviced using conventional tools.
The system is intentionally simple: quality adapters, properly sized hose, dependable fittings, and no unnecessary complexity.
Increased Flow Area Through the Fittings
The factory fittings have an internal diameter of approximately 0.185 inch. Glacier’s stainless-steel fittings increase that passage to approximately 0.300 inch.
Because flow area is based on the square of the radius, the improvement is considerably greater than the diameter comparison alone suggests. The 0.300-inch opening provides approximately 2.6 times the cross-sectional area of the 0.185-inch factory passage.
That does not mean the truck will automatically flow 2.6 times more fuel. Actual fuel delivery remains dependent on the lift pump, filters, plumbing, pressure regulation, and demand. It does mean the Glacier fitting presents substantially more available passage area and removes a known restriction from the system.
Applications and Fitment
Designed for:
- 2007.5 Dodge Ram 6.7L Cummins
- 2008 Dodge Ram 6.7L Cummins
- 2009 Dodge Ram 6.7L Cummins
This kit is intended for trucks retaining the factory-style fuel filter housing and CP3 injection pump.
Kit Contents
The Glacier Diesel Power 2007.5–2009 6.7L Cummins Big Line Kit includes:
- Custom Glacier stainless-steel filter housing adapter
- Custom Glacier stainless-steel CP3 adapter
- Push-Lok fuel fittings
- Full-size 3/8-inch fuel hose
- Required hose clamps
Important Notes
- Replaces the fuel line between the factory filter housing and CP3 only.
- Does not replace the complete fuel supply system from the tank forward.
- Designed for trucks retaining the factory fuel filter housing.
- Compatible with the factory lift pump and many aftermarket lift-pump configurations.
- A properly functioning lift pump is still required.
- Will not correct a failed lift pump, plugged fuel filter, restricted tank pickup, or unrelated fuel-system fault.
- Actual fuel-pressure changes vary based on the complete system.
- Fuel-pressure gauge and sender are not included.
- Route the hose away from exhaust components, sharp edges, and moving parts.
- Inspect all connections for leakage after installation and again after the first complete heat cycle.
- Verify vehicle configuration and fitment before ordering.
Common Failure Point
The pressed-on nylon line and small factory fittings may remain functional for many years, but they still represent one of the narrowest portions of the fuel supply path.
As these trucks age, the original line is also exposed to repeated heat cycles, vibration, engine movement, and diesel fuel. The pressed-on construction makes it less convenient to service than a conventional hose-and-fitting assembly.
Replacing this section removes the restrictive factory plumbing and provides a fresh, serviceable connection between the filter housing and CP3.
However, the Big Line Kit should not be treated as a substitute for complete fuel-system diagnosis. A weak lift pump, plugged filter, damaged tank module, voltage loss, or restriction elsewhere can still cause inadequate fuel delivery.
Installation Overview
Installation requires removing the original pressed-on nylon fuel line between the factory fuel filter housing and CP3 injection pump.
The Glacier stainless-steel adapters are installed at the factory connection points, and the supplied 3/8-inch hose is routed between them using the Push-Lok fittings and clamps.
Keep all open fuel-system connections capped during installation. Dirt or debris introduced while the system is open can travel toward the CP3 and injectors.
After installation:
- Prime the fuel system using the appropriate procedure.
- Pressurize the system before starting the engine.
- Inspect every connection carefully for leakage.
- Start the engine and verify proper operation.
- Recheck the hose routing and connections after the engine reaches operating temperature.
- Inspect the system again after the first complete heat cycle.
Complete Your Fuel System
Complete your Glacier Diesel Power fuel system with:
- Glacier Fuel Boss Mechanical Lift Pump
- Glacier Raptor Pump System
- Glacier Twin Fuel Filter System
- Glacier Severe Service Twin Fuel Filter System
- Fuel-pressure gauge and sender
- Fuel-pressure test fittings
- Replacement Fleetguard fuel filters
- Glacier stainless-steel fuel system adapters