Product Description
CNC Fabrication 422001 99.5-03 7.3L Bowl Retain 4 Line Feed Fuel Line Kit
The CNC Fabrication 422001 Bowl Retain 4 Line Feed Fuel Line Kit is a premium fuel delivery upgrade engineered for 1999.5-2003 Ford 7.3L Power Stroke diesel engines. Designed to eliminate the infamous Number 8 injector knock and reduce fuel starvation issues in the Number 1 and Number 8 cylinders, this system provides significantly improved fuel distribution during heavy throttle operation, towing, and high-RPM driving conditions.
Unlike the restrictive factory fuel delivery system, the CNC Fabrication 422001 utilizes military-grade genuine Brennan high-flow fittings and mandrel-bent 304 Sandvik Coromat stainless steel fuel lines to improve fuel flow to both cylinder heads. By eliminating the factory Vibralok fittings and restrictive O-ring connections commonly associated with fuel leaks and bottlenecks, this kit delivers improved reliability, better fuel distribution, and increased support for modified injectors and performance applications.
Designed to retain the factory fuel bowl, this system provides an excellent foundation for stock, towing, and performance trucks while remaining compatible with future fuel system upgrades.
Features
- Designed for 1999.5-2003 Ford 7.3L Power Stroke engines
- Retains the factory fuel bowl assembly
- 4-line fuel feed design improves fuel distribution
- Helps eliminate Number 8 injector knock
- Reduces fuel starvation to Number 1 and Number 8 cylinders
- Military-grade genuine Brennan high-flow fittings
- Eliminates restrictive factory Vibralok fittings
- Mandrel-bent 304 Sandvik Coromat stainless steel fuel lines
- Improved fuel flow to cylinder head galleries
- Supports stock and modified injector applications
- Manufactured in the USA
- CNC bent in-house for precise fitment and installation
Fitment
- 1999.5 Ford F-Series 7.3L Power Stroke
- 2000 Ford F-Series 7.3L Power Stroke
- 2001 Ford F-Series 7.3L Power Stroke
- 2002 Ford F-Series 7.3L Power Stroke
- 2003 Ford F-Series 7.3L Power Stroke
- Compatible with factory fuel bowl systems
- Compatible with T4 turbocharger conversions
- Compatible with aftermarket HPOP reservoir spacers (custom fitting may be required)
Note: Early 1999 model trucks can use this kit but must have a non-EBPV turbo pedestal or EBPV delete. If using an aftermarket HPOP reservoir spacer, CNC Fabrication may require the spacer for custom line fabrication. Use Loctite 545 or gas-rated thread sealant on pipe-thread fittings during installation. Avoid introducing any thread sealant material into the fuel system.
What's Included
- CNC Fabrication 4-Line Fuel Feed System
- Mandrel-Bent 304 Stainless Steel Fuel Lines
- Genuine Brennan High-Flow Fittings
- All Required Installation Fittings
- Complete Fuel Bowl Retain Plumbing Kit
Specifications
- Manufacturer: CNC Fabrication
- Part Number: 422001
- Application: Fuel Bowl Retain 4-Line Feed Fuel System
- Vehicle Compatibility: 1999.5-2003 Ford 7.3L Power Stroke
- Fuel Bowl Configuration: Retains Factory Fuel Bowl
- Fuel Line Design: 4-Line Feed System
- Line Material: 304 Sandvik Coromat Stainless Steel
- Line Manufacturing: CNC Mandrel Bent
- Fittings: Genuine Brennan High-Flow Fittings
- Fuel Delivery Improvement: Increased Fuel Flow to Cylinder Head Galleries
- Injector Compatibility: Stock Through Large Single-Shot Injectors
- Recommended Pump Upgrade: For Injectors Larger Than 180cc
- Country of Origin: USA
Cross Reference Numbers
422001, CNC422001, 7.3 Fuel Feed Kit, 7.3 Fuel Bowl Retain Kit, 7.3 Four Line Fuel System, 7.3 Fuel Distribution Upgrade, 7.3 Injector Feed Line Kit, 7.3 Fuel Bowl Upgrade Kit
FAQ
What problem does the CNC Fabrication 422001 solve?
This kit helps eliminate the common Number 8 injector knock and reduces fuel starvation issues in the Number 1 and Number 8 cylinders during heavy throttle, towing, and high-RPM operation.
Does this kit eliminate the factory fuel bowl?
No. The 422001 is specifically designed to retain the factory fuel bowl while improving fuel delivery and distribution.
Why replace the factory Vibralok fittings?
The factory Vibralok fittings can become restrictive and are known for O-ring leakage issues. The CNC Fabrication system replaces them with genuine Brennan high-flow fittings for improved reliability and fuel flow.
Will this work with larger injectors?
Yes. This system has been successfully used with injectors ranging from 160/100 up to 450/400 single-shot injectors. For injectors larger than 180cc, an upgraded fuel pump is recommended.
Will this fit an early 1999 Power Stroke?
Yes. Early 1999 trucks can use this kit provided the vehicle has a non-EBPV turbo pedestal or EBPV delete installed.
Can I later upgrade to a fuel bowl delete system?
Yes. CNC Fabrication offers a fuel bowl delete manifold that can retrofit in place of the factory fuel bowl while maintaining compatibility with this line kit.
What fuel pumps are commonly recommended with this system?
CNC Fabrication commonly recommends Fuelab Prodigy pumps for competition applications and AEM 380LPH pumps for mild performance builds. Complete fuel system upgrades may also utilize AirDog II 5G fuel systems.
