If you own a modern Duramax, Cummins, or Powerstroke, chances are you’ve heard about CP4 failures — and why so many diesel owners are converting back to the proven, reliable CP3 or DCR injection pump.
Here at FASS Motorsports, we’re proud to be a trusted source for S&S Diesel CP3 and DCR Conversion Kits. We sell them, ship them nationwide, and professionally install them right here in Franklin County.
Whether you’re trying to prevent a costly CP4 failure or preparing your truck for long-term reliability, the CP3 or DCR conversion is one of the smartest upgrades you can make.
Why So Many Diesel Owners Convert from CP4 to CP3/DCR
The CP4 injection pump was introduced to meet emissions requirements and improve efficiency, but it has developed a reputation for catastrophic failures in certain applications.
When a CP4 fails, it can send metal debris throughout the entire fuel system, often requiring replacement of:
- Injectors
- Fuel rails
- Fuel lines
- Fuel tank cleaning
- High-pressure components
These repairs can easily cost thousands of dollars.
Why We Trust S&S Diesel CP3/DCR Conversion Kits
Not all CP3 conversions are created equal. That’s why we trust and recommend S&S Diesel Motorsport CP3 and DCR Conversion Kits.
S&S Diesel is known for:
- OEM-quality engineering
- Complete, vehicle-specific conversion kits
- Precision manufacturing
- Proven reliability
Their kits are designed for proper fitment, clean installation, and long-term performance.
Supported Applications
At FASS Motorsports, we sell and install S&S Diesel CP3 and DCR Conversion Kits for some of the most popular diesel platforms on the road today.
LML Duramax (2011–2016)
The LML Duramax is well-known for CP4-related failures. Converting to a CP3 significantly improves long-term fuel system reliability.
L5P Duramax (2017–2026)
For the L5P Duramax, which comes from the factory with an HP4 injection pump, an S&S CP3 Conversion is ideal for high-performance use. 10mm, 12mm, and 14mm CP3 options are available for mild-to-wild horsepower levels.
6.7 Cummins (2019–2020)
From 2019 to 2020, Cummins-powered Rams came from the factory with a CP4. Though Ram/Cummins did recall the CP4 shortly after switching back to the CP3, many 2019-2020 Ram 2500/3500 owners are yet to have the recall done, or swap the CP4 for a CP3 themselves.
6.7 Powerstroke (2011–2025)
The CP4 in the 6.7 Powerstroke has also developed a reputation for failures, making DCR conversions an increasingly popular upgrade.
Benefits of CP3/DCR Conversion
Converting to a CP3 or DCR offers several important advantages:
- Improved reliability
- Reduced risk of catastrophic fuel system failure
- Proven long-term durability
- Excellent compatibility with stock and modified trucks
- Peace of mind for daily driving and towing
- Superior to CP4 and HP4 (L5P) for performance/competition use
This upgrade is especially valuable for trucks used for work, towing, or long-distance travel.
Professional Installation Available at FASS Motorsports
Installing a CP3 or DCR conversion kit requires proper tools, knowledge, and attention to detail.
At FASS Motorsports, we're ready to tackle your CP3 conversion kit installation. We ensure:
- Proper installation
- Timely, efficient service
- Safe and reliable operation
Our goal is to protect your truck and ensure long-term reliability.
We Ship Nationwide
Even if you’re not local to Franklin County or the St. Louis area, we can ship S&S Diesel CP3/DCR Conversion Kits directly to you.
We can also help ensure you get the correct kit for your specific truck.
Pair Your CP3/DCR Conversion with a FASS Fuel System
Many owners choose to pair their CP3/DCR conversion with a FASS Fuel System to provide:
- Advanced fuel filtration
- Air and vapor separation
- Consistent fuel pressure
- Maximum injector and pump protection
Clean, consistent fuel supply helps protect your investment.
Why Choose FASS Motorsports for Your CP3/DCR Conversion?
- We carry trusted S&S Diesel products
- We offer professional installation
- We ship nationwide
- We specialize in diesel performance and reliability
We don’t just sell parts — we help protect your truck.
Have questions? We're here to help.
- Phone: (636) 429-7020
- Email: info@fassmotorsports.com
FASS Motorsports
25 Town and Country Dr.
Washington, MO 63090
