Glacier Diesel Power Big Line Kit for Jacobs Exhaust Brake | 2003–2007 Dodge Ram 5.9L Cummins (0306JAKE)
Description
Upgrade the restrictive factory fuel supply line on your 2003–2007 Dodge Ram 5.9L Cummins while maintaining compatibility with your Jacobs exhaust brake using the Glacier Diesel Power Jacobs Big Line Kit.
This kit is specifically engineered for trucks equipped with the Jacobs-brand exhaust brake, where the factory vacuum pump, exhaust brake components, and fuel plumbing create clearance issues that prevent the standard Big Line Kit from fitting correctly. Rather than forcing owners to modify or relocate components, Glacier designed this package with the proper fittings, routing, and hardware needed for a clean installation.
Like the standard Big Line Kit, this system replaces the restrictive factory hard line and banjo fittings between the fuel-filter housing and the CP3 injection pump with a full 3/8-inch fuel supply path. The result is a smoother-flowing fuel system with reduced restriction between the lift pump and the CP3.
In addition, this kit includes a billet aluminum fuel-pressure sender tee, making it easy to install a fuel-pressure sender or gauge without purchasing additional adapters.
Whether you're towing, daily driving, or building a higher-performance common-rail Cummins, this Jacobs-specific kit removes one of the factory fuel system's most restrictive sections while preserving compatibility with your exhaust-brake-equipped truck.
Features
- Fits 2003–2007 Dodge Ram 2500 and 3500 5.9L Cummins
- Specifically designed for trucks equipped with a Jacobs exhaust brake
- Replaces the restrictive factory filter-to-CP3 fuel line
- Full 3/8-inch fuel supply hose
- High-flow banjo fitting
- Stainless-steel adapter
- Premium 90-degree Push-Lok fittings
- Billet aluminum fuel-pressure sender tee included
- Cummins sealing washers included
- Fuel hose and clamps included
- Direct bolt-on installation
- Compatible with factory and most aftermarket lift pumps
- SKU: 0306JAKE
Why Does the Jacobs Exhaust Brake Require a Different Kit?
One of the most common mistakes made by owners is purchasing the standard Big Line Kit for a truck equipped with a Jacobs exhaust brake.
The Jacobs exhaust-brake system occupies space around the CP3 inlet and vacuum-pump area that the standard plumbing uses. Because of this, the routing, banjo fitting, and installation hardware must be different to provide proper clearance.
Rather than modifying fuel lines or relocating components, this kit is designed specifically to fit around the Jacobs exhaust-brake system while still providing a larger, less restrictive fuel path.
If your truck is equipped with a Jacobs exhaust brake, this is the correct version of the Big Line Kit.
Why Upgrade the Factory Fuel Line?
The CP3 injection pump depends entirely on a steady supply of low-pressure fuel from the lift pump.
Before fuel reaches the CP3, it must travel through:
- Fuel tank pickup
- Supply line
- Lift pump
- Fuel filter
- Factory outlet plumbing
- CP3 inlet
The original line between the filter housing and CP3 uses a small-diameter hard line and restrictive banjo fittings.
As engine fuel demand increases, these restrictions create additional pressure loss before fuel ever reaches the CP3.
Replacing that section with a full 3/8-inch fuel path helps reduce restriction and allows more of the lift pump's available pressure to reach the injection pump.
Understanding Pressure Loss
A larger fuel line does not create pressure.
Instead, it reduces resistance.
The lift pump is responsible for producing fuel pressure.
The plumbing determines how much of that pressure is lost before fuel reaches the CP3.
As engine demand increases, pressure loss across restrictive fittings becomes increasingly important.
By increasing the available flow area and reducing sharp restrictions, the Glacier Big Line Kit helps minimize unnecessary pressure loss.
Some trucks may experience measurable improvements in CP3 inlet pressure after installation, although actual results depend on the condition and capacity of the entire fuel system.
Glacier Tech Tip
Fuel pressure should always be measured under load.
Many trucks maintain acceptable pressure while idling but experience significant pressure drop during:
- Heavy towing
- Wide-open throttle
- Long highway grades
- Higher RPM operation
- Performance tuning
Testing fuel pressure under real operating conditions provides a much more accurate picture of fuel-system health than checking pressure at idle alone.
Standard Big Line Kit vs. Jacobs Big Line Kit
Standard Big Line Kit
- Designed for trucks without a Jacobs exhaust brake
- Will not provide proper clearance on Jacobs-equipped applications
- Does not include the Jacobs-specific routing
Jacobs Big Line Kit
- Engineered specifically for Jacobs exhaust-brake-equipped trucks
- Proper routing around the exhaust-brake components
- Includes a high-flow banjo fitting
- Includes a billet aluminum sender tee
- Maintains proper component clearance
Choosing the correct kit eliminates unnecessary installation issues and ensures proper fitment.
Why the Billet Sender Tee Matters
Fuel pressure is one of the most important indicators of low-pressure fuel-system health.
The included billet aluminum sender tee provides a convenient location for installing:
- Fuel-pressure sender
- Mechanical fuel-pressure gauge
- Electronic pressure sensor
- Diagnostic test equipment
Instead of purchasing separate adapters or modifying fuel lines later, the sender tee allows future monitoring with minimal additional work.
What Is Included?
The Glacier Jacobs Big Line Kit includes:
- Stainless-steel adapter
- High-flow banjo fitting
- 90-degree Push-Lok fitting
- Push-Lok fitting for the CP3 connection
- Billet aluminum fuel-pressure sender tee
- Cummins sealing washers
- 3/8-inch fuel hose
- Hose clamps
- Installation hardware
Applications and Fitment
Fits:
- 2003 Dodge Ram 2500 5.9L Cummins
- 2003 Dodge Ram 3500 5.9L Cummins
- 2004 Dodge Ram 2500 5.9L Cummins
- 2004 Dodge Ram 3500 5.9L Cummins
- 2005 Dodge Ram 2500 5.9L Cummins
- 2005 Dodge Ram 3500 5.9L Cummins
- 2006 Dodge Ram 2500 5.9L Cummins
- 2006 Dodge Ram 3500 5.9L Cummins
- 2007 Dodge Ram 2500 5.9L Cummins
- 2007 Dodge Ram 3500 5.9L Cummins
Designed specifically for 5.9L Common Rail Cummins trucks equipped with a Jacobs exhaust brake.
Installation Notes
Before installation:
- Verify the truck is equipped with a Jacobs exhaust brake.
- Clean the filter-housing and CP3 connection points.
- Replace all supplied sealing washers.
- Route the hose away from heat and moving components.
- Confirm clearance around the exhaust-brake assembly.
- Prime the fuel system after installation.
- Inspect all fittings for leaks.
- Verify fuel pressure after installation.
Do not overtighten the banjo fitting or adapters. Excessive torque can damage sealing surfaces or threads.
Important Notes
- Only for trucks equipped with a Jacobs exhaust brake.
- Does not fit standard non-Jacobs applications.
- Does not ship to California.
- Designed for 2003–2007 5.9L Common Rail Cummins engines.
- Includes a billet aluminum fuel-pressure sender tee.
- Verify exhaust-brake configuration before ordering.
- Check for leaks after installation.
- Monitor fuel pressure whenever diagnosing supply-side issues.
Common Failure Point
One of the most overlooked restrictions in the factory fuel system is the short section of plumbing between the filter housing and the CP3.
As trucks age, additional restrictions from contaminated filters, worn hoses, or fuel-system modifications can compound the pressure loss created by the factory plumbing.
Upgrading this section removes one unnecessary bottleneck, but it should be viewed as part of a complete fuel-system strategy that includes:
- A healthy lift pump
- Clean fuel filters
- An unrestricted tank pickup
- Leak-free fuel lines
- Proper fuel-pressure monitoring
Is This the Correct Kit?
This kit is the correct choice if:
- Your truck is a 2003–2007 5.9L Common Rail Cummins.
- It is equipped with a Jacobs exhaust brake.
- You want to replace the restrictive filter-to-CP3 fuel line.
- You want to add a fuel-pressure sender using the included billet tee.
- You want a direct-fit solution without modifying the exhaust-brake system.
This is not the correct kit if:
- Your truck does not have a Jacobs exhaust brake.
- Your truck uses a completely custom fuel system.
- The factory filter housing has been removed.
- You have a 6.7L Cummins.
- You are looking for a complete lift-pump system rather than upgraded supply plumbing.
Complete Your Fuel System
For maximum reliability and fuel-system performance, pair this kit with:
- Glacier Fuel Boss mechanical lift-pump system
- Glacier MK-2 Micro-Kleen filtration system
- Fuel-pressure gauge
- Fuel-pressure sender
- High-flow tank pickup
- Fleetguard replacement fuel filters
- Fuel-pressure test fittings
- CP3 inlet fittings
- Replacement fuel hoses
The Glacier Diesel Power 0306JAKE Big Line Kit is the correct solution for 2003–2007 5.9L Cummins owners running a Jacobs exhaust brake who want to eliminate the restrictive factory filter-to-CP3 plumbing while retaining proper component clearance. With its full 3/8-inch fuel path, high-flow fittings, and included billet sender tee, it provides an efficient and installation-friendly upgrade for both stock and modified common-rail fuel systems.
Glacier Diesel Power Big Line Kit for Jacobs Exhaust Brake | 2003–2007 Dodge Ram 5.9L Cummins (0306JAKE)
Description
Upgrade the restrictive factory fuel supply line on your 2003–2007 Dodge Ram 5.9L Cummins while maintaining compatibility with your Jacobs exhaust brake using the Glacier Diesel Power Jacobs Big Line Kit.
This kit is specifically engineered for trucks equipped with the Jacobs-brand exhaust brake, where the factory vacuum pump, exhaust brake components, and fuel plumbing create clearance issues that prevent the standard Big Line Kit from fitting correctly. Rather than forcing owners to modify or relocate components, Glacier designed this package with the proper fittings, routing, and hardware needed for a clean installation.
Like the standard Big Line Kit, this system replaces the restrictive factory hard line and banjo fittings between the fuel-filter housing and the CP3 injection pump with a full 3/8-inch fuel supply path. The result is a smoother-flowing fuel system with reduced restriction between the lift pump and the CP3.
In addition, this kit includes a billet aluminum fuel-pressure sender tee, making it easy to install a fuel-pressure sender or gauge without purchasing additional adapters.
Whether you're towing, daily driving, or building a higher-performance common-rail Cummins, this Jacobs-specific kit removes one of the factory fuel system's most restrictive sections while preserving compatibility with your exhaust-brake-equipped truck.
Features
- Fits 2003–2007 Dodge Ram 2500 and 3500 5.9L Cummins
- Specifically designed for trucks equipped with a Jacobs exhaust brake
- Replaces the restrictive factory filter-to-CP3 fuel line
- Full 3/8-inch fuel supply hose
- High-flow banjo fitting
- Stainless-steel adapter
- Premium 90-degree Push-Lok fittings
- Billet aluminum fuel-pressure sender tee included
- Cummins sealing washers included
- Fuel hose and clamps included
- Direct bolt-on installation
- Compatible with factory and most aftermarket lift pumps
- SKU: 0306JAKE
Why Does the Jacobs Exhaust Brake Require a Different Kit?
One of the most common mistakes made by owners is purchasing the standard Big Line Kit for a truck equipped with a Jacobs exhaust brake.
The Jacobs exhaust-brake system occupies space around the CP3 inlet and vacuum-pump area that the standard plumbing uses. Because of this, the routing, banjo fitting, and installation hardware must be different to provide proper clearance.
Rather than modifying fuel lines or relocating components, this kit is designed specifically to fit around the Jacobs exhaust-brake system while still providing a larger, less restrictive fuel path.
If your truck is equipped with a Jacobs exhaust brake, this is the correct version of the Big Line Kit.
Why Upgrade the Factory Fuel Line?
The CP3 injection pump depends entirely on a steady supply of low-pressure fuel from the lift pump.
Before fuel reaches the CP3, it must travel through:
- Fuel tank pickup
- Supply line
- Lift pump
- Fuel filter
- Factory outlet plumbing
- CP3 inlet
The original line between the filter housing and CP3 uses a small-diameter hard line and restrictive banjo fittings.
As engine fuel demand increases, these restrictions create additional pressure loss before fuel ever reaches the CP3.
Replacing that section with a full 3/8-inch fuel path helps reduce restriction and allows more of the lift pump's available pressure to reach the injection pump.
Understanding Pressure Loss
A larger fuel line does not create pressure.
Instead, it reduces resistance.
The lift pump is responsible for producing fuel pressure.
The plumbing determines how much of that pressure is lost before fuel reaches the CP3.
As engine demand increases, pressure loss across restrictive fittings becomes increasingly important.
By increasing the available flow area and reducing sharp restrictions, the Glacier Big Line Kit helps minimize unnecessary pressure loss.
Some trucks may experience measurable improvements in CP3 inlet pressure after installation, although actual results depend on the condition and capacity of the entire fuel system.
Glacier Tech Tip
Fuel pressure should always be measured under load.
Many trucks maintain acceptable pressure while idling but experience significant pressure drop during:
- Heavy towing
- Wide-open throttle
- Long highway grades
- Higher RPM operation
- Performance tuning
Testing fuel pressure under real operating conditions provides a much more accurate picture of fuel-system health than checking pressure at idle alone.
Standard Big Line Kit vs. Jacobs Big Line Kit
Standard Big Line Kit
- Designed for trucks without a Jacobs exhaust brake
- Will not provide proper clearance on Jacobs-equipped applications
- Does not include the Jacobs-specific routing
Jacobs Big Line Kit
- Engineered specifically for Jacobs exhaust-brake-equipped trucks
- Proper routing around the exhaust-brake components
- Includes a high-flow banjo fitting
- Includes a billet aluminum sender tee
- Maintains proper component clearance
Choosing the correct kit eliminates unnecessary installation issues and ensures proper fitment.
Why the Billet Sender Tee Matters
Fuel pressure is one of the most important indicators of low-pressure fuel-system health.
The included billet aluminum sender tee provides a convenient location for installing:
- Fuel-pressure sender
- Mechanical fuel-pressure gauge
- Electronic pressure sensor
- Diagnostic test equipment
Instead of purchasing separate adapters or modifying fuel lines later, the sender tee allows future monitoring with minimal additional work.
What Is Included?
The Glacier Jacobs Big Line Kit includes:
- Stainless-steel adapter
- High-flow banjo fitting
- 90-degree Push-Lok fitting
- Push-Lok fitting for the CP3 connection
- Billet aluminum fuel-pressure sender tee
- Cummins sealing washers
- 3/8-inch fuel hose
- Hose clamps
- Installation hardware
Applications and Fitment
Fits:
- 2003 Dodge Ram 2500 5.9L Cummins
- 2003 Dodge Ram 3500 5.9L Cummins
- 2004 Dodge Ram 2500 5.9L Cummins
- 2004 Dodge Ram 3500 5.9L Cummins
- 2005 Dodge Ram 2500 5.9L Cummins
- 2005 Dodge Ram 3500 5.9L Cummins
- 2006 Dodge Ram 2500 5.9L Cummins
- 2006 Dodge Ram 3500 5.9L Cummins
- 2007 Dodge Ram 2500 5.9L Cummins
- 2007 Dodge Ram 3500 5.9L Cummins
Designed specifically for 5.9L Common Rail Cummins trucks equipped with a Jacobs exhaust brake.
Installation Notes
Before installation:
- Verify the truck is equipped with a Jacobs exhaust brake.
- Clean the filter-housing and CP3 connection points.
- Replace all supplied sealing washers.
- Route the hose away from heat and moving components.
- Confirm clearance around the exhaust-brake assembly.
- Prime the fuel system after installation.
- Inspect all fittings for leaks.
- Verify fuel pressure after installation.
Do not overtighten the banjo fitting or adapters. Excessive torque can damage sealing surfaces or threads.
Important Notes
- Only for trucks equipped with a Jacobs exhaust brake.
- Does not fit standard non-Jacobs applications.
- Does not ship to California.
- Designed for 2003–2007 5.9L Common Rail Cummins engines.
- Includes a billet aluminum fuel-pressure sender tee.
- Verify exhaust-brake configuration before ordering.
- Check for leaks after installation.
- Monitor fuel pressure whenever diagnosing supply-side issues.
Common Failure Point
One of the most overlooked restrictions in the factory fuel system is the short section of plumbing between the filter housing and the CP3.
As trucks age, additional restrictions from contaminated filters, worn hoses, or fuel-system modifications can compound the pressure loss created by the factory plumbing.
Upgrading this section removes one unnecessary bottleneck, but it should be viewed as part of a complete fuel-system strategy that includes:
- A healthy lift pump
- Clean fuel filters
- An unrestricted tank pickup
- Leak-free fuel lines
- Proper fuel-pressure monitoring
Is This the Correct Kit?
This kit is the correct choice if:
- Your truck is a 2003–2007 5.9L Common Rail Cummins.
- It is equipped with a Jacobs exhaust brake.
- You want to replace the restrictive filter-to-CP3 fuel line.
- You want to add a fuel-pressure sender using the included billet tee.
- You want a direct-fit solution without modifying the exhaust-brake system.
This is not the correct kit if:
- Your truck does not have a Jacobs exhaust brake.
- Your truck uses a completely custom fuel system.
- The factory filter housing has been removed.
- You have a 6.7L Cummins.
- You are looking for a complete lift-pump system rather than upgraded supply plumbing.
Complete Your Fuel System
For maximum reliability and fuel-system performance, pair this kit with:
- Glacier Fuel Boss mechanical lift-pump system
- Glacier MK-2 Micro-Kleen filtration system
- Fuel-pressure gauge
- Fuel-pressure sender
- High-flow tank pickup
- Fleetguard replacement fuel filters
- Fuel-pressure test fittings
- CP3 inlet fittings
- Replacement fuel hoses
The Glacier Diesel Power 0306JAKE Big Line Kit is the correct solution for 2003–2007 5.9L Cummins owners running a Jacobs exhaust brake who want to eliminate the restrictive factory filter-to-CP3 plumbing while retaining proper component clearance. With its full 3/8-inch fuel path, high-flow fittings, and included billet sender tee, it provides an efficient and installation-friendly upgrade for both stock and modified common-rail fuel systems.