Fleece FPE-FPTP-GM-1116 Return Fuel Pressure Test Port | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Features:

• Simple CP4 failure diagnostic tool
• Designed specifically for return fuel pressure
• Compatible with LML Duramax systems
• Allows connection of pressure gauge
• Supports accurate fuel pressure monitoring
• Essential for troubleshooting injector returns
• Quick install into return fuel system
• Helps identify failing CP4 pumps
• Durable construction for long-term use
• Works without major fuel system changes

Know Exactly What Your Fuel System Is Doing

If you're chasing down performance issues or trying to get ahead of a potential CP4 pump failure, this is a must-have tool in your diagnostic kit. The Fleece Return Fuel Pressure Test Port gives you clear insight into what’s happening inside your LML Duramax’s return system, helping you pinpoint problems before they become costly repairs. Whether you’re in the middle of a fuel pressure mystery or just prefer to stay ahead of the curve with preventative maintenance, this port makes the job easier and more accurate. It’s a small, simple upgrade that makes a big impact when it comes to diagnosing one of the most failure-prone components on the 2011–2016 Duramax. With an easy installation process and a design built for durability, this port is ready for repeated use by both weekend wrenchers and shop techs. You don’t need to tear apart your fuel system or guess what’s happening with your returns. Just install it, hook up a gauge, and read what your truck’s been trying to tell you.

Precision Monitoring For Better CP4 Diagnostics

The Fleece FPE-FPTP-GM-1116 Return Fuel Pressure Test Port is engineered specifically for monitoring the return side of the fuel system on LML-equipped Duramax trucks. It threads directly into the return line and allows for quick installation of a standard pressure gauge, giving technicians the ability to gather accurate real-time pressure data. This is especially critical when diagnosing CP4 injection pump failures, which often cause low return pressure and poor engine performance. The port is machined for durability and built to withstand the demands of repeated service use, making it an ideal addition to any diesel shop or enthusiast's toolbox. It eliminates the need for temporary or makeshift test fittings and provides a reliable, leak-free connection point. Whether you're trying to confirm a known issue or collecting data for a larger diagnostic picture, this test port gives you the clarity and consistency you need. It fits seamlessly on 2011–2016 6.6L Duramax LML platforms without requiring modifications to the existing fuel return setup.

Fits: 2011, 2012, 2013, 2014, 2015, 2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Notes:

• Designed specifically for 2011-2016 GM LML Duramax engines
• Ideal for diagnosing CP4 injection pump failures
• Installs directly into the return fuel system
• Allows accurate monitoring of return fuel pressure
• Useful for confirming low pressure or flow restrictions
• Helps prevent misdiagnosis during fuel system troubleshooting
• Durable and built for repeated diagnostic use
• Eliminates guesswork by enabling real-time pressure readings
• Compatible with standard pressure gauges
• No need to cut or modify factory lines for installation