Glacier Diesel Power 2003–2007 Dodge Ram 5.9L Cummins Twin CP3 3/8" Big Line Kit (0307TCP3)
Description
When you're running a twin CP3 fuel system, the factory feed line quickly becomes a restriction.
Through extensive testing, Glacier Diesel Power found that many twin CP3-equipped trucks perform best with 15–20 PSI of supply pressure to prevent high rail pressure codes at idle. The problem is delivering enough fuel volume at those lower pressures through the restrictive factory fuel plumbing.
The Glacier Diesel Power Twin CP3 Big Line Kit replaces the undersized factory hard lines and restrictive fittings with custom high-flow stainless steel adapters, premium 3/8-inch fuel hose, and quality Push-Lok fittings to maximize fuel delivery to both CP3 injection pumps. The result is improved fuel volume, reduced restriction, and more stable fuel supply for high-horsepower common rail builds.
Whether your truck is a competition build, sled puller, drag truck, or high-performance street truck, this kit helps ensure your twin CP3 system receives the fuel volume it demands.
Features
- Fits 2003–2007 Dodge Ram 5.9L Cummins with Twin CP3 conversion
- Designed specifically for twin CP3 fuel systems
- Replaces restrictive factory hard lines and fittings
- Premium 3/8-inch high-flow fuel hose
- Custom stainless steel adapters
- High-quality Push-Lok fittings
- Includes Cummins sealing washers
- Optional billet aluminum fuel pressure sender tee
- Supports high-horsepower fuel systems
- Designed and manufactured by Glacier Diesel Power
- Made in the USA
Why Upgrade to the Twin CP3 Big Line Kit?
Installing a second CP3 dramatically increases fuel demand, but many trucks continue feeding both pumps through factory plumbing that's less than 1/4-inch inside diameter.
That restriction can reduce available fuel volume and make it more difficult to maintain proper supply pressure, especially on aggressive fuel systems.
The Twin CP3 Big Line Kit eliminates these bottlenecks by replacing the factory plumbing with a true high-flow 3/8-inch system designed specifically for twin pump applications.
Benefits include:
- Increased fuel volume to both CP3 pumps
- Reduced inlet restriction
- Improved fuel pressure stability
- Better support for large injectors and high horsepower
- Cleaner, more serviceable installation
Glacier Fuel System Tech Tip
More lift pump pressure is not always better on twin CP3 systems.
Testing has shown that many twin CP3 combinations operate best with approximately 15–20 PSI of supply pressure. Higher feed pressures can actually contribute to high rail pressure codes at idle on some trucks. The goal is to maximize fuel volume while maintaining the proper supply pressure—not simply increase pressure.
That's exactly what Glacier designed this Big Line Kit to accomplish.
Why Glacier Built It This Way
The factory fuel line between the filter housing and CP3 was never intended to support the demands of two injection pumps.
Glacier engineered this system with custom stainless steel adapters and full 3/8-inch plumbing to remove one of the largest restrictions in the low-pressure fuel system. Every component was selected to maximize flow while maintaining reliable sealing and long-term durability.
The optional billet aluminum fuel pressure sender tee also provides a convenient location for installing a fuel pressure gauge without additional adapters or plumbing modifications.
Applications
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
Important: Designed specifically for trucks equipped with a Twin CP3 conversion. If your truck uses a Jacobs exhaust brake with an engine-mounted vacuum pump, please contact us before ordering to ensure proper fitment.
Kit Contents
The Glacier Diesel Power Twin CP3 Big Line Kit includes:
- Custom stainless steel adapters
- Premium 3/8-inch fuel hose
- 90° Push-Lok fittings
- Cummins sealing washers
- Hose clamps
- Optional billet aluminum fuel pressure sender tee
- Installation hardware
Important Notes
- Fits 2003–2007 Dodge Ram trucks equipped with the 5.9L Common Rail Cummins.
- Designed for Twin CP3 fuel systems only.
- Not intended for stock single CP3 applications.
- Verify Twin CP3 kit compatibility before ordering.
- Prime the fuel system after installation.
- Inspect all fittings and fuel connections for leaks before operating the engine.
- Recheck all hose clamps and fittings after the first complete heat cycle.
Common Failure Point
Many Twin CP3 trucks continue using the restrictive factory feed plumbing long after upgrading the rest of the fuel system. As horsepower increases, the small factory fittings and hard lines can become one of the biggest bottlenecks in the entire low-pressure fuel system.
The Glacier Twin CP3 Big Line Kit removes those restrictions, allowing the lift pump to deliver greater fuel volume to both injection pumps. While this kit cannot compensate for an undersized or failing lift pump, it helps eliminate unnecessary restrictions that can limit the performance of an otherwise capable fuel system.
Complete Your Fuel System
Complete your Twin CP3 fuel system with:
- Glacier Fuel Boss Mechanical Lift Pump
- Glacier Fuel Pressure Gauge and Sender
- Glacier Fuel Pressure Test Fittings
- Glacier Fuel Tank Vent Kit
- Glacier Twin Fuel Filter Systems
- Glacier Fuel Return Line Upgrades
- Glacier Billet Fuel Pressure Sender Tees
Glacier Diesel Power 2003–2007 Dodge Ram 5.9L Cummins Twin CP3 3/8" Big Line Kit (0307TCP3)
Description
When you're running a twin CP3 fuel system, the factory feed line quickly becomes a restriction.
Through extensive testing, Glacier Diesel Power found that many twin CP3-equipped trucks perform best with 15–20 PSI of supply pressure to prevent high rail pressure codes at idle. The problem is delivering enough fuel volume at those lower pressures through the restrictive factory fuel plumbing.
The Glacier Diesel Power Twin CP3 Big Line Kit replaces the undersized factory hard lines and restrictive fittings with custom high-flow stainless steel adapters, premium 3/8-inch fuel hose, and quality Push-Lok fittings to maximize fuel delivery to both CP3 injection pumps. The result is improved fuel volume, reduced restriction, and more stable fuel supply for high-horsepower common rail builds.
Whether your truck is a competition build, sled puller, drag truck, or high-performance street truck, this kit helps ensure your twin CP3 system receives the fuel volume it demands.
Features
- Fits 2003–2007 Dodge Ram 5.9L Cummins with Twin CP3 conversion
- Designed specifically for twin CP3 fuel systems
- Replaces restrictive factory hard lines and fittings
- Premium 3/8-inch high-flow fuel hose
- Custom stainless steel adapters
- High-quality Push-Lok fittings
- Includes Cummins sealing washers
- Optional billet aluminum fuel pressure sender tee
- Supports high-horsepower fuel systems
- Designed and manufactured by Glacier Diesel Power
- Made in the USA
Why Upgrade to the Twin CP3 Big Line Kit?
Installing a second CP3 dramatically increases fuel demand, but many trucks continue feeding both pumps through factory plumbing that's less than 1/4-inch inside diameter.
That restriction can reduce available fuel volume and make it more difficult to maintain proper supply pressure, especially on aggressive fuel systems.
The Twin CP3 Big Line Kit eliminates these bottlenecks by replacing the factory plumbing with a true high-flow 3/8-inch system designed specifically for twin pump applications.
Benefits include:
- Increased fuel volume to both CP3 pumps
- Reduced inlet restriction
- Improved fuel pressure stability
- Better support for large injectors and high horsepower
- Cleaner, more serviceable installation
Glacier Fuel System Tech Tip
More lift pump pressure is not always better on twin CP3 systems.
Testing has shown that many twin CP3 combinations operate best with approximately 15–20 PSI of supply pressure. Higher feed pressures can actually contribute to high rail pressure codes at idle on some trucks. The goal is to maximize fuel volume while maintaining the proper supply pressure—not simply increase pressure.
That's exactly what Glacier designed this Big Line Kit to accomplish.
Why Glacier Built It This Way
The factory fuel line between the filter housing and CP3 was never intended to support the demands of two injection pumps.
Glacier engineered this system with custom stainless steel adapters and full 3/8-inch plumbing to remove one of the largest restrictions in the low-pressure fuel system. Every component was selected to maximize flow while maintaining reliable sealing and long-term durability.
The optional billet aluminum fuel pressure sender tee also provides a convenient location for installing a fuel pressure gauge without additional adapters or plumbing modifications.
Applications
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
Important: Designed specifically for trucks equipped with a Twin CP3 conversion. If your truck uses a Jacobs exhaust brake with an engine-mounted vacuum pump, please contact us before ordering to ensure proper fitment.
Kit Contents
The Glacier Diesel Power Twin CP3 Big Line Kit includes:
- Custom stainless steel adapters
- Premium 3/8-inch fuel hose
- 90° Push-Lok fittings
- Cummins sealing washers
- Hose clamps
- Optional billet aluminum fuel pressure sender tee
- Installation hardware
Important Notes
- Fits 2003–2007 Dodge Ram trucks equipped with the 5.9L Common Rail Cummins.
- Designed for Twin CP3 fuel systems only.
- Not intended for stock single CP3 applications.
- Verify Twin CP3 kit compatibility before ordering.
- Prime the fuel system after installation.
- Inspect all fittings and fuel connections for leaks before operating the engine.
- Recheck all hose clamps and fittings after the first complete heat cycle.
Common Failure Point
Many Twin CP3 trucks continue using the restrictive factory feed plumbing long after upgrading the rest of the fuel system. As horsepower increases, the small factory fittings and hard lines can become one of the biggest bottlenecks in the entire low-pressure fuel system.
The Glacier Twin CP3 Big Line Kit removes those restrictions, allowing the lift pump to deliver greater fuel volume to both injection pumps. While this kit cannot compensate for an undersized or failing lift pump, it helps eliminate unnecessary restrictions that can limit the performance of an otherwise capable fuel system.
Complete Your Fuel System
Complete your Twin CP3 fuel system with:
- Glacier Fuel Boss Mechanical Lift Pump
- Glacier Fuel Pressure Gauge and Sender
- Glacier Fuel Pressure Test Fittings
- Glacier Fuel Tank Vent Kit
- Glacier Twin Fuel Filter Systems
- Glacier Fuel Return Line Upgrades
- Glacier Billet Fuel Pressure Sender Tees