CP3 Pump 3/8 inch Inlet Fitting

Features:

• Increases fuel flow to the CP3 pump
• 3/8 inch inlet replaces stock 1/4 inch
• Improves fuel delivery by up to 70%
• Reduces risk of cavitation damage
• Optimizes CP3 pump performance
• Designed for 2001–2010 GM Duramax engines
• Supports high-pressure fuel systems
• Prevents excessive suction on fuel lines
• Simple upgrade with direct fitment
• Ideal for tuned or performance builds
• Machined for durability and precision fit
• Compatible with stock and upgraded CP3 pumps

Give Your CP3 The Fuel It Deserves

If you're building power with your Duramax and still running a stock CP3 inlet, you're leaving performance on the table. The PPE 3/8 Inch Inlet Fitting is a simple yet powerful upgrade that unlocks the full potential of your CP3 pump. By increasing the inner diameter from the factory 1/4 inch to 3/8 inch, this fitting improves fuel flow by up to 70 percent. That added fuel volume makes a noticeable difference, especially when you're running a high-pressure system or aggressive tuning. You get smoother acceleration, better throttle response, and more reliable performance across the board. And because this upgrade helps eliminate cavitation caused by excessive suction, it also protects your pump from long-term wear. It’s a small investment that delivers big returns for anyone serious about maximizing their fuel system.

Engineered For High Flow And CP3 Efficiency

The PPE 113060501 CP3 Pump Inlet Fitting is designed to reduce restriction in the fuel supply line of 2001–2010 GM 2500HD and 3500HD trucks equipped with the 6.6L Duramax engine. Its 3/8 inch diameter provides significantly more volume than the factory 1/4 inch fitting, allowing your CP3 to maintain stable fuel delivery at higher RPMs and under heavier loads. By minimizing suction effort, the fitting helps prevent cavitation, a common issue in modified fuel systems where the pump struggles to draw adequate fuel. This translates to smoother operation, more consistent rail pressure, and improved long-term reliability of the injection system. The fitting is machined for a precise seal and straightforward installation, making it a direct-fit upgrade for stock and performance builds alike. It’s especially beneficial in setups where tuning or increased fuel demand places extra strain on the pump. Whether you're building a towing beast or prepping for competition, this upgrade helps ensure your CP3 is never starved of fuel.

Fits: 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 GM Silverado/Sierra 2500HD/3500HD

Notes:

• Designed to increase fuel flow to the CP3 pump
• Replaces restrictive factory 1/4 inch inlet fitting
• Improves flow efficiency by up to 70%
• Helps prevent cavitation and suction-related damage
• Ideal for high-performance or tuned fuel systems
• Supports optimum CP3 pump performance under load
• Compatible with 2001–2010 GM Duramax 6.6L engines
• Fitting is precision machined for a direct fit
• Recommended for use in modified or high-demand applications
• Easy to install with no major modifications required
• Works with stock and aftermarket CP3 pumps
• Upgrading helps maintain consistent fuel rail pressure